New adult strength guidance

The American College of Sports Medicine has rewritten its adult strength advice around a simple point: regular resistance training matters more than a “perfect” program. (acsm.org) The group published the update on March 17, 2026, calling it its first major resistance-training revision since 2009. It said the new position stand drew on 137 reviews covering more than 30,000 participants. (acsm.org) The paper appears in the April 2026 issue of *Medicine & Science in Sports & Exercise* under the title “Resistance Training Prescription for Muscle Function, Hypertrophy, and Physical Performance in Healthy Adults: An Overview of Reviews.” Stuart M. Phillips of McMaster University chaired the author group. (acsm.org) Resistance training means making muscles work against a load, whether that load comes from barbells, elastic bands, machines, or body weight. The new guidance says adults can improve strength, muscle size, power, gait speed, balance, and stair-climbing ability with regular training. (acsm.org) The update shifts away from one-size-fits-all rules and toward matching training to a goal. For strength, the college recommends heavier loads at about 80% of one-repetition maximum for two to three sets per exercise. (acsm.org) For muscle growth, the guidance points to higher weekly volume, around 10 sets per muscle group. For power, it recommends moderate loads at 30% to 70% of one-repetition maximum and moving the weight quickly on the lifting phase. (acsm.org) The document also makes room for simpler routines that people can keep doing. Its infographic says adults should train all major muscle groups at least two days a week and build gradually over time. (acsm.org) That emphasis reflects the college’s finding that the biggest gains come when someone goes from doing no resistance training to doing some resistance training consistently. ACSM said home programs, bands, and body-weight exercises can all work. (acsm.org) The review also downplays several gym staples for the average healthy adult. ACSM said training to momentary muscle failure, choosing machines over free weights, or using complex periodization did not consistently change outcomes in the evidence it reviewed. (acsm.org) The closing message is narrower than “lift weights” and broader than a bodybuilding plan: pick a routine that fits your schedule, goals, and comfort level, then keep showing up. ACSM’s own summary puts it this way: the best program is the one a person will actually do. (acsm.org)