How Many Sets and Reps Should You Do?

For general health, the CDC suggests at least one set of 8 to 12 repetitions for each muscle-strengthening exercise, and two or three sets if you want more benefit. Each set should be hard enough that another rep would be difficult without help (CDC). If you’re training to build strength or muscle, the American College of Sports Medicine’s 2026 position stand advises at least two sets per exercise. It found that strength gains were greatest with heavier loads and that muscle growth was greater with 10 or more sets per muscle group per week (ACSM, 2026).

Sets and reps by goal

Goal	Sets	Reps and load
General health	At least 1 set per exercise, 2 or 3 for more benefit (CDC)	8 to 12 reps, to the point where another rep is hard without help (same source)
Strength	2 to 3 sets per exercise per session (ACSM, 2026)	Heavier loads, at or above 80% of your one-rep max (same source)
Muscle size	10 or more sets per muscle group per week (same source)	Anywhere from 30% to 100% of your one-rep max, as long as sets are hard (same source)
Muscular endurance	Not settled by the 2026 review, which had no data on which prescriptions work best (same source)	The 2009 ACSM stand recommended 40% to 60% of one-rep max for more than 15 reps (ACSM, 2009)

Your one-rep max (1RM) is the most weight you can lift once with good form. You don’t need to test it. The fewer reps you can do with a weight, the closer that weight is to your 1RM.

Whatever your goal, the federal Physical Activity Guidelines say muscle-strengthening activity should be of moderate or greater intensity, involve all major muscle groups and happen on 2 or more days a week (HHS).

How many reps

The 8 to 12 range is the standard advice for general fitness. Both the CDC and MedlinePlus use it (CDC; MedlinePlus). The 2009 ACSM position stand also recommended loads you can lift for 8 to 12 reps for beginners. For intermediate and advanced lifters it recommended a wider range of 1 to 12 reps, with an emphasis on 6 to 12 reps for muscle growth and heavy 1- to 6-rep loads for strength (ACSM, 2009).

The newer evidence is less strict about reps for muscle growth. The 2026 ACSM position stand, which updates the 2009 one, found that muscle growth didn’t depend on load anywhere from 30% to 100% of 1RM. Lighter weights for more reps and heavier weights for fewer reps both build muscle. Load does matter for maximal strength: the strength gains were greater at 80% of 1RM or more (ACSM, 2026). The review also points out that the number of reps you can do in a set goes down as the load goes up (same source).

So the two ACSM statements differ mainly on muscle growth. The 2009 stand favored 6 to 12 reps, and the 2026 stand found a much wider range works. The 2026 stand is newer and is built on 137 systematic reviews covering more than 30,000 participants (same source). If your goal is to lift as heavy as possible, include heavier sets with fewer reps. If you mainly want to get stronger for daily life and build some muscle, 8 to 12 reps works well and is easier to judge.

How many sets

The CDC treats one set per exercise as the minimum and two or three sets as better (CDC). The 2026 ACSM position stand goes a step further. It found that one set beats no sets and two sets beat one, and it advises healthy adults to do at least two sets per exercise (ACSM, 2026). The two sources differ because they answer slightly different questions: the CDC sets a baseline for health, while the ACSM review looks at what improves strength and muscle size.

More sets help, but each extra set adds less than the one before. The ACSM authors describe a 2025 analysis in which the benefit leveled off past about 2 to 3 sets per exercise for strength and about 18 to 20 sets per week for muscle growth (same source). They also say the exact number of sets needed to get the best results can’t be pinned down from the evidence they reviewed.

Sets per week

For muscle growth, it helps to count sets per muscle group per week as well as per workout. The 2026 review linked 10 or more weekly sets per muscle group to greater growth (ACSM, 2026). An earlier meta-analysis of 15 studies found a graded dose-response: each extra weekly set was associated with a 0.37% larger gain in muscle size (Schoenfeld et al., 2017). Training a muscle with 5 sets in each of two sessions gets you to 10 a week. For how to spread sessions across the week, see how often you should lift weights.

How hard each set should be

Whatever the rep count, each set needs real effort. The CDC says to work to the point where it’s hard to do another repetition without help (CDC). The NHS describes it as working to the point where you need a short rest before repeating the activity (NHS).

You don’t have to go all the way to failure. The 2026 ACSM review found that training to momentary muscle failure did not improve gains in strength, size or power. Enough effort can come from stopping near failure, with about 2 to 3 reps left in reserve (ACSM, 2026).

How long to rest between sets

The 2009 ACSM position stand recommended rests of 3 to 5 minutes between heavy strength sets and 1 to 2 minutes for muscle-building sets (ACSM, 2009). The 2026 position stand found that strength gains were the same with short rests (under a minute) and long rests (over a minute). There wasn’t enough data to say whether rest length affects muscle growth (ACSM, 2026). Since the newer review found no strength difference, rest until you feel ready to do the next set well.

How many exercises

The federal guidelines say to work all major muscle groups (HHS), which the CDC lists as legs, hips, back, chest, abdomen, shoulders and arms (CDC). The authors of the 2026 ACSM statement suggest a simple way to cover them. In their view, upper-body pushing, upper-body pulling, lower-body pushing and lower-body pulling exercises are enough to target the major muscle groups (ACSM, 2026).

A simple starting point

If you’re not sure where to begin, here’s one way to put the guidance together:

• Choose at least one exercise each for upper-body push, upper-body pull, lower-body push and lower-body pull.
• Do 2 sets of 8 to 12 reps for each, stopping a rep or two short of failure.
• Train at least 2 days a week.
• As the sets get easier, add reps, weight or a third set, as described in our guide to progressive overload.

If you’re starting from scratch, our bodyweight workout for beginners uses this kind of structure without equipment. If you have a chronic condition or symptoms, the federal guidelines advise being under the care of a health care provider. Pregnant women can ask their provider whether or how to adjust their activity (HHS).