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In a non-randomized cluster study conducted in the Faroe Islands, 179 pupils aged 7\u201316 participated in three weekly 40-minute sessions for 10 weeks as part of a school-wide program alongside physical education. Acute responses were assessed in a subsample (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200953) using heart rate, accelerations, perceived exertion, and enjoyment, with individualized thresholds and stratification based on baseline cardiorespiratory fitness assessed using a shuttle run test. Sessions consistently elicited moderate-to-vigorous intensity, with mean heart rate ranging from 67.2\u2009\u00b1\u20091.3 to 69.9\u2009\u00b1\u20091.4%\u00a0of maximal heart rate. Pupils spent 57.9\u2009\u00b1\u20093.6 to 64.9\u2009\u00b1\u20093.3% of session time at moderate-to-vigorous intensity, including up to 31.8\u2009\u00b1\u20093.0% at vigorous intensity. Despite higher physiological and perceived exertion among pupils in the low fitness group, enjoyment was comparable across fitness groups. Cardiorespiratory fitness improved among the intervention sample (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u2009117), with a tendency for greater gains in the lowest fitness tertile, although differences were not statistically significant (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.063, \u03b5\u00b2 = 0.024). These findings suggest that FIT FIRST FOR ALL can elicit health-promoting intensity and high enjoyment across age and fitness groups when delivered school-wide through teacher-led sessions.\n                  <\/jats:p>","DOI":"10.1038\/s41598-026-55141-4","type":"journal-article","created":{"date-parts":[[2026,5,29]],"date-time":"2026-05-29T20:32:26Z","timestamp":1780086746000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Acute physiological and perceptual responses in the FIT FIRST FOR ALL school-based physical activity program"],"prefix":"10.1038","volume":"16","author":[{"given":"Helgi Winther","family":"Olsen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T\u00f3rur","family":"Sj\u00far\u00f0arson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B\u00e1ra Berghamar","family":"Danielsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"May-Britt","family":"Skoradal","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Krustrup","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Magni","family":"Mohr","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Malte Nejst","family":"Larsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,5,29]]},"reference":[{"key":"55141_CR1","unstructured":"World Health Organization. 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