Sets, reps and weight

How many sets and reps should I do?

By GyroscopeUpdated November 14, 20265 sources

For strength, 2 to 3 sets of a heavy weight on the big lifts, done early in the workout, with each set stopping two or three reps short. For muscle size, 10 or more hard sets per muscle each week. Five moves at 2 to 3 sets, twice a week, covers both for most people.

Ask ten lifters and you’ll get ten answers. Three sets of ten. Five sets of five. Twenty sets for chest on chest day. A pyramid that goes 12, 10, 8, 6. Most of these work, which is why people argue about them forever. The research has gotten much clearer in the last few years, and for most goals it takes fewer sets than people expect.

Sets are like coats of paint

The first coat does most of the covering. The second evens it out. A fifth coat uses up the afternoon and the wall looks about the same. Sets work the same way. The 2026 position stand from the American College of Sports Medicine (ACSM) found muscle growth kept rising with more weekly sets, but past about 18 to 20 a week per muscle the extra gains got small.

What the biggest review found

The ACSM pulled together 137 reviews, covering more than 30,000 people, for its 2026 stand.

The stand also found that training to failure, machines against free weights, and fancy planned phases made no consistent difference. Sets two to three reps short of failure did the job, and two sessions a week was the floor for strength.

Where “three sets of ten” came from

It came from an army hospital. In 1945, Thomas DeLorme, an army doctor, was rebuilding the legs of injured World War II soldiers with several sets of each patient’s heaviest 10-rep weight. By 1948 he’d settled on three sets of ten, each heavier than the last, and called it Progressive Resistance Exercise. It’s been the default ever since, and it still works, along with plenty of other set and rep schemes.

Heavy reps for strength, any reps for muscle

A 2017 review of 21 studies took every set to failure and compared light weights (60% of max or less) with heavy ones. Muscle grew about the same. The heavy groups gained more strength. That’s why the table splits the two goals. If you want to lift more, lift heavier for fewer reps. If you want more muscle, the rep count can be high or low, as long as the set ends close to hard.

How the sets add up across a week

The weekly total counts for more than how you split it. A 2018 review of 22 studies found people who trained more days got stronger, but when the total sets were matched, the number of days made no difference. Two full-body sessions with 3 sets per move gives each big muscle roughly 6 hard sets a week, which is a solid strength dose. Three sessions takes you near 10.

Use the one-rep max calculator to turn any set into a max estimate and a percent table, so you can pick weights for 5, 8 or 10 reps without ever testing a max.