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To promote physical activity (PA) at scale, smartphone-based mHealth (mobile health) software apps offer a promising solution.<\/jats:p>\n <\/jats:sec>\n \n Objective<\/jats:title>\n This study aims to evaluate the feasibility of implementing an mHealth app offering very small (\u201cmicro\u201d) financial incentives for PA in Leeds, United Kingdom.<\/jats:p>\n <\/jats:sec>\n \n Methods<\/jats:title>\n \n A 5-week single-arm proof-of-concept study was conducted with rolling recruitment among Caterpillar Health app users between September 12 and December 12, 2022 (Obesity-Related Behavioral Intervention Trial model, phase IIa). Users earned microincentives in the form of \u201cpoints,\u201d redeemable for consumer rewards (eg, movie tickets and gym passes), for meeting personalized daily step goals (US $0.13 per goal achieved; set using data from a 5-day baseline) and completing educational quizzes (US $0.33 per quiz). Descriptive statistics assessed feasibility outcomes (ie, reach, recruitment, retention, engagement, and acceptability) and preliminary effectiveness. Paired-samples\n t<\/jats:italic>\n tests (\n P<\/jats:italic>\n <.05) examined changes in weekly mean daily step count (from baseline) and step goal achievement over 5 weeks.\n <\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n \n Of 285 app downloads, 46 users consented to participate (recruitment rate: 16.1%). Participants (mean age: 39.9, SD 11.1 y; 71.1%, 33\/46 woman) had a baseline step count of 5598 (SD 2664) steps\/day. A total of 25 participants remained engaged (ie, completed at least 1 quiz) at study week 5 (retention rate: 54.3%). Acceptability was high, with 75% of respondents (12\/16) indicating they would recommend the app. Weekly mean daily step count did not significantly increase from baseline (mean difference 317, SD 2273,\n P<\/jats:italic>\n =.53). Weekly daily step goal achievement rate (%) decreased from study week 1 to 5 (\u221223.23, SD 22.85,\n P<\/jats:italic>\n =.02).\n <\/jats:p>\n <\/jats:sec>\n \n Conclusions<\/jats:title>\n Despite lower-than-expected recruitment and no statistically significant PA increase, relatively high engagement and acceptability suggest future pilot testing (Obesity-Related Behavioral Intervention Trial model, phase IIb) of a refined intervention (eg, wider selection of loyalty reward partners) and modified study protocol (eg, simplified consent process) is warranted.<\/jats:p>\n <\/jats:sec>","DOI":"10.2196\/85484","type":"journal-article","created":{"date-parts":[[2026,3,4]],"date-time":"2026-03-04T17:15:08Z","timestamp":1772644508000},"page":"e85484-e85484","source":"Crossref","is-referenced-by-count":2,"title":["Evaluating an Incentive-Based mHealth App for Physical Activity Promotion Using the Obesity-Related Behavioral Intervention Trial Model: Small Cohort Study"],"prefix":"10.2196","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8157-840X","authenticated-orcid":false,"given":"Babac","family":"Salmani","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4881-820X","authenticated-orcid":false,"given":"Madison S","family":"Hiemstra","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0636-7316","authenticated-orcid":false,"given":"Harry","family":"Prapavessis","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4621-3717","authenticated-orcid":false,"given":"Leigh M","family":"Vanderloo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2772-9614","authenticated-orcid":false,"given":"Marc S","family":"Mitchell","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1010","published-online":{"date-parts":[[2026,4,10]]},"reference":[{"key":"R1","unstructured":"Physical activity: applying all our health. 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