{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,17]],"date-time":"2026-06-17T10:19:42Z","timestamp":1781691582858,"version":"3.54.5"},"reference-count":77,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2020,11,12]],"date-time":"2020-11-12T00:00:00Z","timestamp":1605139200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>Known for its ability to improve fitness and health, high-intensity functional training (HIFT) focuses on functional movements completed at high intensities, often yielding outcomes superior to repetitive aerobic workouts. Preference for and tolerance of high-intensity exercise are associated with enjoyment of and adherence to HIFT. Similarly, the social environment present within CrossFit, a popular group-based HIFT modality, is important to the enjoyment of and adherence to HIFT. This study aimed to test whether preference and tolerance were related to social connections within CrossFit networks. Linear network autocorrelation models (LNAMs) and exponential random graph models (ERGMs) were computed on sociometric and attribute data from members of three CrossFit networks (n = 197). LNAMs showed the preference and tolerance scores of someone\u2019s social connections were associated with their own in all three gyms, and ERGMs demonstrated preference and tolerance scores were associated with the presence of social ties within all networks. This study is the first to provide evidence for a relationship between social connections and preference and tolerance. Future longitudinal research is needed to determine if the social environment may influence and optimize a person\u2019s preference of and tolerance for HIFT.<\/jats:p>","DOI":"10.3390\/ijerph17228370","type":"journal-article","created":{"date-parts":[[2020,11,12]],"date-time":"2020-11-12T10:00:32Z","timestamp":1605175232000},"page":"8370","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Network Analysis of the Social Environment Relative to Preference for and Tolerance of Exercise Intensity in CrossFit Gyms"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6876-2931","authenticated-orcid":false,"given":"Megan S.","family":"Patterson","sequence":"first","affiliation":[{"name":"College of Education and Human Development, Texas A&amp;M University, College Station, TX 77845, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6837-408X","authenticated-orcid":false,"given":"Katie M.","family":"Heinrich","sequence":"additional","affiliation":[{"name":"College of Health and Human Sciences, Kansas State University, Manhattan, KS 66506, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7886-4456","authenticated-orcid":false,"given":"Tyler","family":"Prochnow","sequence":"additional","affiliation":[{"name":"Robbins College of Health and Human Sciences, Baylor University, Waco, TX 76706, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7814-7705","authenticated-orcid":false,"given":"Taylor","family":"Graves-Boswell","sequence":"additional","affiliation":[{"name":"College of Education and Human Development, Texas A&amp;M University, College Station, TX 77845, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8679-0872","authenticated-orcid":false,"given":"Mandy N.","family":"Spadine","sequence":"additional","affiliation":[{"name":"College of Education and Human Development, Texas A&amp;M University, College Station, TX 77845, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,11,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"959","DOI":"10.1001\/jamainternmed.2015.0533","article-title":"Leisure Time Physical Activity and Mortality: A Detailed Pooled Analysis of the Dose-Response Relationship","volume":"175","author":"Arem","year":"2015","journal-title":"JAMA Intern. Med."},{"key":"ref_2","first-page":"131","article-title":"The health benefits of physical activity and cardiorespiratory fitness","volume":"58","author":"McKinney","year":"2016","journal-title":"B. C. Med. J."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"471","DOI":"10.1136\/jech-2017-209703","article-title":"What they say and what they do: Comparing physical activity across the USA, England and the Netherlands","volume":"72","author":"Kapteyn","year":"2018","journal-title":"J. Epidemiol. Community Health"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"454","DOI":"10.1016\/j.amepre.2010.12.016","article-title":"Physical Activity in U.S. Adults","volume":"40","author":"Tucker","year":"2011","journal-title":"Am. J. Prev. Med."},{"key":"ref_5","unstructured":"World Health Organization (2020). Physical Activity and Adults, World Health Organization."},{"key":"ref_6","unstructured":"U.S. Department of Health and Human Services (2018). Physical Activity Guidelines for Americans."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1996","DOI":"10.1097\/00005768-200212000-00020","article-title":"Correlates of adults\u2019 participation in physical activity: Review and update","volume":"34","author":"Trost","year":"2002","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Heinrich, K.M., Patel, P.M., O\u2019Neal, J.L., and Heinrich, B.S. (2014). High-intensity compared to moderate-intensity training for exercise initiation, enjoyment, adherence, and intentions: An intervention study. BMC Public Health, 14.","DOI":"10.1186\/1471-2458-14-789"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Feito, Y., Heinrich, K.M., Butcher, S.J., and Poston, W.S.C. (2018). High-Intensity Functional Training (HIFT): Definition and Research Implications for Improved Fitness. Sports, 6.","DOI":"10.3390\/sports6030076"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1125","DOI":"10.7205\/MILMED-D-12-00143","article-title":"Mission Essential Fitness: Comparison of Functional Circuit Training to Traditional Army Physical Training for Active Duty Military","volume":"177","author":"Heinrich","year":"2012","journal-title":"Mil. Med."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"812","DOI":"10.1111\/ecc.12338","article-title":"High-intensity functional training improves functional movement and body composition among cancer survivors: A pilot study","volume":"24","author":"Heinrich","year":"2015","journal-title":"Eur. J. Cancer Care"},{"key":"ref_12","first-page":"811","article-title":"Crossfit training changes brain-derived neurotrophic factor and irisin levels at rest, after wingate and progressive tests, and improves aerobic capacity and body composition of young physically active men and women","volume":"66","author":"Wojna","year":"2015","journal-title":"J. Physiol. Pharmacol. Off. J. Pol. Physiol. Soc."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Feito, Y., Hoffstetter, W., Serafini, P., and Mangine, G. (2018). Changes in body composition, bone metabolism, strength, and skill-specific performance resulting from 16-weeks of HIFT. PLoS ONE, 13.","DOI":"10.1371\/journal.pone.0198324"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1227","DOI":"10.23736\/S0022-4707.16.06434-3","article-title":"A comparison of the motivational factors between CrossFit participants and other resistance exercise modalities: A pilot study","volume":"57","author":"Fisher","year":"2017","journal-title":"J. Sports Med. Phys. Fitness"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1097\/FCH.0000000000000133","article-title":"Mapping Coaches\u2019 Views of Participation in CrossFit to the Integrated Theory of Health Behavior Change and Sense of Community","volume":"40","author":"Heinrich","year":"2017","journal-title":"Fam. Community Health"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1186\/s40798-018-0124-5","article-title":"CrossFit Overview: Systematic Review and Meta-analysis","volume":"4","author":"Claudino","year":"2018","journal-title":"Sports Med. Open"},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Patterson, M.S., Gagnon, L.R., Vukelich, A., Brown, S.E., Nelon, J.L., and Prochnow, T. (2019). Social networks, group exercise, and anxiety among college students. J. Am. Coll. Health, 1\u20139.","DOI":"10.1080\/07448481.2019.1679150"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"e331","DOI":"10.7717\/peerj.331","article-title":"Regular group exercise is associated with improved mood but not quality of life following stroke","volume":"2","author":"McDonnell","year":"2014","journal-title":"PeerJ"},{"key":"ref_19","unstructured":"Lautner, S.C., Patterson, M.S., Graves-Boswell, T., Spadine, M.N., and Heinrich, K.M. Exploring the social side of CrossFit: A qualitative study. Ment. Health Soc. Incl., in press."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"568","DOI":"10.1080\/07399332.2015.1078333","article-title":"Satisfaction of Basic Psychological Needs, Self-Determined Exercise Motivation, and Psychological Well-Being in Mothers Exercising in Group-Based Versus Individual-Based Contexts","volume":"37","author":"Lovell","year":"2016","journal-title":"Health Care Women Int."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1545","DOI":"10.1177\/1359105316664132","article-title":"The role of social capital and community belongingness for exercise adherence: An exploratory study of the CrossFit gym model","volume":"23","author":"Hawkins","year":"2018","journal-title":"J. Health Psychol."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"101521","DOI":"10.1016\/j.psychsport.2019.04.011","article-title":"Why do they do it? Differences in high-intensity exercise-affect between those with higher and lower intensity preference and tolerance","volume":"47","author":"Box","year":"2020","journal-title":"Psychol. Sport Exerc."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"499","DOI":"10.1080\/02640410701624523","article-title":"The Preference for and Tolerance of the Intensity of Exercise Questionnaire: A psychometric evaluation among college women","volume":"26","author":"Ekkekakis","year":"2008","journal-title":"J. Sports Sci."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"350","DOI":"10.1123\/jsep.27.3.350","article-title":"Some like It Vigorous: Measuring Individual Differences in the Preference for and Tolerance of Exercise Intensity","volume":"27","author":"Ekkekakis","year":"2005","journal-title":"J. Sport Exerc. Psychol."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1831","DOI":"10.1080\/02640414.2016.1239833","article-title":"Exercise-induced hypoalgesia: Pain tolerance, preference and tolerance for exercise intensity, and physiological correlates following dynamic circuit resistance exercise","volume":"35","author":"Baiamonte","year":"2017","journal-title":"J. Sports Sci."},{"key":"ref_26","first-page":"550","article-title":"Preference for and Tolerance of the Intensity of Exercise questionnaire: Brazilian Portuguese version","volume":"17","author":"Ekkekakis","year":"2015","journal-title":"Braz. J. Kinanthr. Hum. Perform."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"2443","DOI":"10.1519\/JSC.0000000000000420","article-title":"Role of Self-Reported Individual Differences in Preference for and Tolerance of Exercise Intensity in Fitness Testing Performance","volume":"28","author":"Hall","year":"2014","journal-title":"J. Strength Cond. Res."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"547","DOI":"10.1080\/02640414.2010.545427","article-title":"High-intensity interval running is perceived to be more enjoyable than moderate-intensity continuous exercise: Implications for exercise adherence","volume":"29","author":"Bartlett","year":"2011","journal-title":"J. Sports Sci."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"641","DOI":"10.2165\/11590680-000000000-00000","article-title":"The Pleasure and Displeasure People Feel When they Exercise at Different Intensities: Decennial Update and Progress towards a Tripartite Rationale for Exercise Intensity Prescription","volume":"41","author":"Ekkekakis","year":"2011","journal-title":"Sports Med."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1348\/135910705X43606","article-title":"The psychological and physiological responses of sedentary individuals to prescribed and preferred intensity exercise","volume":"11","author":"Parfitt","year":"2006","journal-title":"Br. J. Health Psychol."},{"key":"ref_31","first-page":"65","article-title":"Preference or propinquity? The relative contribution of selection and opportunity to friendship homophily in college","volume":"1","author":"Godley","year":"2008","journal-title":"Connections"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1111\/j.1467-9531.2010.01225.x","article-title":"Dynamic Networks and Behavior: Separating Selection from Influence","volume":"40","author":"Steglich","year":"2010","journal-title":"Sociol. Methodol."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"415","DOI":"10.1146\/annurev.soc.27.1.415","article-title":"Birds of a Feather: Homophily in Social Networks","volume":"27","author":"McPherson","year":"2001","journal-title":"Annu. Rev. Sociol."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"407","DOI":"10.14423\/SMJ.0000000000000131","article-title":"Declaration of Helsinki\u2014The World\u2019s Document of Conscience and Responsibility","volume":"107","author":"Holt","year":"2014","journal-title":"South. Med. J."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"867","DOI":"10.2471\/BLT.07.045120","article-title":"The STROBE Initiative The Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) Statement: Guidelines for reporting observational studies*","volume":"85","author":"Altman","year":"2007","journal-title":"Bull. World Health Organ."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"59","DOI":"10.1080\/07448481.2018.1462820","article-title":"Social network analysis for assessing college-aged adults\u2019 health: A systematic review","volume":"67","author":"Patterson","year":"2018","journal-title":"J. Am. Coll. Health"},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Valente, T.W. (2010). Social Networks and Health: Models, Methods, and Applications, Oxford University Press.","DOI":"10.1093\/acprof:oso\/9780195301014.001.0001"},{"key":"ref_38","unstructured":"Gile, K.J., and Handcock, M.S. (2019, September 03). Analysis of Networks with Missing Data with Application to the National Longitudinal Study of Adolescent Health. Available online: https:\/\/rss.onlinelibrary.wiley.com\/doi\/abs\/10.1111\/rssc.12184."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"203","DOI":"10.1097\/01.BCR.0000075849.08794.36","article-title":"Researchers BEWARE! Attrition and Nonparticipation at Large","volume":"24","author":"McQuaid","year":"2003","journal-title":"J. Burn Care Rehabil."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"124","DOI":"10.1016\/j.socnet.2005.05.001","article-title":"On the robustness of centrality measures under conditions of imperfect data","volume":"28","author":"Borgatti","year":"2006","journal-title":"Soc. Netw."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"283","DOI":"10.1016\/S0378-8733(03)00012-1","article-title":"The stability of centrality measures when networks are sampled","volume":"25","author":"Costenbader","year":"2003","journal-title":"Soc. Netw."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"609","DOI":"10.1111\/j.1467-9507.2012.00661.x","article-title":"The Effects of Participation Rate on the Internal Reliability of Peer Nomination Measures: Participation and Sociometric Reliability","volume":"22","author":"Marks","year":"2013","journal-title":"Soc. Dev."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"477","DOI":"10.1080\/02640410400021492","article-title":"Variation and homogeneity in affective responses to physical activity of varying intensities: An alternative perspective on dose\u2014Response based on evolutionary considerations","volume":"23","author":"Ekkekakis","year":"2005","journal-title":"J. Sports Sci."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"504","DOI":"10.1016\/S0092-6566(03)00046-1","article-title":"A very brief measure of the Big-Five personality domains","volume":"37","author":"Gosling","year":"2003","journal-title":"J. Res. Personal."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"312","DOI":"10.2466\/pr0.102.1.312-316","article-title":"Relationship among Four Big Five Measures of Different Length","volume":"102","author":"Furnham","year":"2008","journal-title":"Psychol. Rep."},{"key":"ref_46","unstructured":"John, O.P., Robins, R.W., and Pervin, L.A. (2008). Handbook of Personality: Theory and Research, Guilford Press. [3rd ed.]."},{"key":"ref_47","unstructured":"Kline, P. (2007). The Handbook of Psychological Testing, Routledge."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"373","DOI":"10.1002\/per.542","article-title":"Measuring the Big Five with single items using a bipolar response scale","volume":"19","author":"Woods","year":"2005","journal-title":"Eur. J. Personal."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"606","DOI":"10.1046\/j.1525-1497.2001.016009606.x","article-title":"The PHQ-9: Validity of a brief depression severity measure","volume":"16","author":"Kroenke","year":"2001","journal-title":"J. Gen. Intern. Med."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"163","DOI":"10.1016\/j.jad.2008.06.026","article-title":"The PHQ-8 as a measure of current depression in the general population","volume":"114","author":"Kroenke","year":"2009","journal-title":"J. Affect. Disord."},{"key":"ref_51","unstructured":"Sarason, S.B. (1974). The Psychological Sense of Community: Prospects for a Community Psychology, Jossey-Bass. [1st ed.]."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"349","DOI":"10.1123\/jsm.27.5.349","article-title":"Examining Sense of Community in Sport: Developing the Multidimensional \u2018SCS\u2019 Scale","volume":"27","author":"Warner","year":"2013","journal-title":"J. Sport Manag."},{"key":"ref_53","unstructured":"IBM (2018). IMB SPSS Statistics for Windows, IRB Corporation."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1016\/S0378-8733(01)00049-1","article-title":"Modeling social influence through network autocorrelation: Constructing the weight matrix","volume":"24","author":"Leenders","year":"2002","journal-title":"Soc. Netw."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1108\/MHRJ-11-2019-0044","article-title":"Depressive symptoms associations with online and in person networks in an online gaming community: A pilot study","volume":"25","author":"Prochnow","year":"2020","journal-title":"Ment. Health Rev. J."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"889","DOI":"10.1123\/jpah.2019-0655","article-title":"Network Effects on Adolescents\u2019 Perceived Barriers to Physical Activity","volume":"17","author":"Prochnow","year":"2020","journal-title":"J. Phys. Act. Health"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"1548","DOI":"10.18637\/jss.v024.i01","article-title":"Statnet: Software Tools for the Statistical Modeling of Network Data","volume":"24","author":"Handcock","year":"2008","journal-title":"J. Stat Softw."},{"key":"ref_58","unstructured":"R Core Team R (2020). A Language and Environment for Statistical Computing, R Foundation for Statistical Computing."},{"key":"ref_59","doi-asserted-by":"crossref","unstructured":"Lusher, D., Koskinen, J., and Robins, G. (2013). Exponential Random Graph Models for Social Networks: Theory, Methods, and Applications, Cambridge University Press. Structural Analysis in the Social Sciences.","DOI":"10.1017\/CBO9780511894701"},{"key":"ref_60","unstructured":"Mroczek, D.K., and Little, T.D. (2006). A Proposed Theory of the Adult Development of Intraindividual Variability in Trait-Manifesting Behavior. Handbook of Personality Development, Lawrence Erlbaum Associates."},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"825","DOI":"10.1111\/j.1467-6494.2007.00458.x","article-title":"Situation-Based Contingencies Underlying Trait-Content Manifestation in Behavior","volume":"75","author":"Fleeson","year":"2007","journal-title":"J. Personal."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"103929","DOI":"10.1016\/j.jrp.2020.103929","article-title":"Inside the happy personality: Personality states, situation experience, and state affect mediate the relation between personality and affect","volume":"85","author":"Kritzler","year":"2020","journal-title":"J. Res. Personal."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1016\/j.ypmed.2016.02.037","article-title":"Adherence to community based group exercise interventions for older people: A mixed-methods systematic review","volume":"87","author":"Farrance","year":"2016","journal-title":"Prev. Med."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"e2018","DOI":"10.7717\/peerj.2018","article-title":"Feasibility and benefits of group-based exercise in residential aged care adults: A pilot study for the GrACE programme","volume":"4","author":"Fien","year":"2016","journal-title":"PeerJ"},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"278","DOI":"10.1007\/s12160-012-9454-6","article-title":"The Case for Conscientiousness: Evidence and Implications for a Personality Trait Marker of Health and Longevity","volume":"45","author":"Bogg","year":"2013","journal-title":"Ann. Behav. Med."},{"key":"ref_66","doi-asserted-by":"crossref","first-page":"505","DOI":"10.1037\/0278-6133.27.5.505","article-title":"Do conscientious individuals live longer? A quantitative review","volume":"27","author":"Kern","year":"2008","journal-title":"Health Psychol."},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"775","DOI":"10.1111\/j.1467-6494.2008.00504.x","article-title":"Conscientiousness, the transtheoretical model of change, and exercise: A neo-socioanalytic integration of trait and social-cognitive frameworks in the prediction of behavior","volume":"76","author":"Bogg","year":"2008","journal-title":"J. Personal."},{"key":"ref_68","unstructured":"Duckworth, A. (2016). Grit: The Power of Passion and Perseverance, Scribner."},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"612","DOI":"10.1177\/1359105312451866","article-title":"Grit, conscientiousness, and the transtheoretical model of change for exercise behavior","volume":"18","author":"Reed","year":"2013","journal-title":"J. Health Psychol."},{"key":"ref_70","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1016\/j.socnet.2004.11.008","article-title":"Centrality and network flow","volume":"27","author":"Borgatti","year":"2005","journal-title":"Soc. Netw."},{"key":"ref_71","doi-asserted-by":"crossref","first-page":"215","DOI":"10.1016\/0378-8733(78)90021-7","article-title":"Centrality in social networks: Conceptual clarification","volume":"1","author":"Freeman","year":"1979","journal-title":"Soc. Netw."},{"key":"ref_72","doi-asserted-by":"crossref","first-page":"481","DOI":"10.1037\/pspi0000189","article-title":"What predicts who we approach for social support? Tests of the attachment figure and strong ties hypotheses","volume":"118","author":"Kammrath","year":"2020","journal-title":"J. Personal. Soc. Psychol."},{"key":"ref_73","doi-asserted-by":"crossref","first-page":"411","DOI":"10.1177\/1043463103154001","article-title":"The Strength of Strong Ties: A Model of Contact-Making in Policy Networks with Evidence from U.S. Health Politics","volume":"15","author":"Carpenter","year":"2003","journal-title":"Ration. Soc."},{"key":"ref_74","doi-asserted-by":"crossref","first-page":"8","DOI":"10.1007\/s00038-006-5062-1","article-title":"Gender differences in leisure-time physical activity","volume":"52","author":"Azevedo","year":"2007","journal-title":"Int. J. Public Health"},{"key":"ref_75","doi-asserted-by":"crossref","first-page":"14753","DOI":"10.1038\/ncomms14753","article-title":"Exercise contagion in a global social network","volume":"8","author":"Aral","year":"2017","journal-title":"Nat. Commun."},{"key":"ref_76","doi-asserted-by":"crossref","first-page":"189","DOI":"10.1097\/00001504-200503000-00013","article-title":"Exercise and well-being: A review of mental and physical health benefits associated with physical activity","volume":"18","author":"Penedo","year":"2005","journal-title":"Curr. Opin. Psychiatry"},{"key":"ref_77","doi-asserted-by":"crossref","unstructured":"Lin, N. (2001). Social Capital: A Theory of Social Structure and Action, Cambridge University Press.","DOI":"10.1017\/CBO9780511815447"}],"container-title":["International Journal of Environmental Research and Public Health"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1660-4601\/17\/22\/8370\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T10:32:29Z","timestamp":1760178749000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1660-4601\/17\/22\/8370"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,11,12]]},"references-count":77,"journal-issue":{"issue":"22","published-online":{"date-parts":[[2020,11]]}},"alternative-id":["ijerph17228370"],"URL":"https:\/\/doi.org\/10.3390\/ijerph17228370","relation":{},"ISSN":["1660-4601"],"issn-type":[{"value":"1660-4601","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,11,12]]}}}