Exercise snacks work
A BJSM review (Rodríguez et al., 2026) found multiple ≤5‑minute vigorous 'exercise snacks' (think stair climbs) across the day improved cardiorespiratory fitness and muscular endurance in inactive adults — with high adherence and intensity as the key. Short, frequent bouts may be a pragmatic way to boost fitness without long gym sessions. x.com/CoreyTwine/status/2032436128926564370
Rodríguez et al.'s systematic review was first posted online in the British Journal of Sports Medicine on October 7, 2025bjsm.bmj.com. The analysis pooled 11 randomized controlled trials involving 414 participants (69.1% women) across age groups with mean ages from 18.7 to 74.2 yearsbjsm.bmj.com. Intervention protocols ranged 4–12 weeks and were delivered 3–7 days per week, with intensities described as moderate-to-vigorous up to near‑maximal in some trialsbjsm.bmj.com. Younger and middle‑aged trials mostly used stair‑climbing protocols, while older‑adult studies favoured leg‑focused strength sequences or tai chi‑style movementseurekalert.org. The pooled effect for cardiorespiratory outcomes was large (Hedges' g = 1.37; 95% CI 0.58–2.17; p<0.005; k=6), though heterogeneity was high (I2=71.4%)bjsm.bmj.com. For muscular endurance in older adults the meta‑analytic effect was smaller but positive (g = 0.40; 95% CI 0.06–0.75; p=0.02; I2=0%; k=4)bjsm.bmj.com. No significant changes were found for lower‑limb strength, body composition, blood pressure or blood lipids, and the review reported very high trial compliance (91.1%) with 82.8% adherence across interventionsbjsm.bmj.com.
