Fitness for aging bodies

The American College of Sports Medicine released a major update to its resistance‑training position stand on March 17, 2026 — the first comprehensive update since 2009 — stressing training each major muscle group 2–3 days weekly with 2–4 sets of 8–12 reps as core guidance. (acsm.org) U.S. aging‑nutrition guidance increasingly recommends higher protein than the 0.8 g/kg RDA, with agencies and reviews advising about 1.0–1.2 g/kg bodyweight per day for most older adults and higher intakes for those who are frail or recovering from illness. (acl.gov) Randomized‑trial meta‑analyses find “combined” strength-plus‑endurance programs deliver larger gains in cardiorespiratory fitness and functional performance than single‑mode programs, with same‑session combined training frequently used in trials of people over 50. (sciencedirect.com) Sleep guidance cited in recent reviews places adults at 7–9 hours per night and narrows recommended sleep for people over 65 to about 7–8 hours, with the National Institute on Aging noting sleep disorders (like sleep apnea and insomnia) become more common with age. (thensf.org) Newer evidence on tracking finds higher frequency of activity self‑monitoring correlates with more consistent physical activity in older cohorts; a March 2026 cross‑sectional analysis of 615 older adults reported stronger engagement among frequent trackers, and multiple reviews show wearables can aid but require sustained uptake. (mdpi.com) Nutrition science papers and recent reviews flag two research gaps: optimal per‑meal protein distribution to stimulate muscle protein synthesis in older adults remains unsettled, and trials testing tailored protein targets for frail subgroups are limited. (sciencedirect.com)