Sets and reps: what they mean
A rep (repetition) is one full movement: lowering the bar to your chest and pressing it back up is one rep of the bench press. A set is a group of reps done in a row before you rest. "3 x 10" means 3 sets of 10 reps, with rest between each set.
The difference between sets and reps is the difference between the dose per round and the number of rounds. Reps per set mostly decide how heavy the weight is. Sets decide how much total work you do. Our guide on how many sets per week covers the second half of that equation; this page is about the first.
Rep ranges by goal
Think of reps as a continuum rather than strict zones. Every range builds some strength and some muscle, but each leans in one direction.
| Goal | Reps per set | Rough load | Rest | Effort |
|---|---|---|---|---|
| Maximal strength | 1 to 5 | Above about 80 to 85 % of 1RM | 3 to 5 min | Often 1 to 3 reps short of failure |
| Strength and size | 5 to 8 | About 75 to 85 % of 1RM | 2 to 3 min | 1 to 3 reps short of failure |
| Muscle growth | 8 to 15 | About 60 to 75 % of 1RM | 1.5 to 2.5 min | 0 to 3 reps short of failure |
| Muscle growth, small muscles | 12 to 20 | Light | 1 to 1.5 min | Close to failure |
| Muscular endurance | 15 to 30+ | Light | 30 s to 1 min | Close to failure |
The percentages are approximate. How many reps you can do at a given percentage varies between people and exercises. The one rep max calculator gives you a working estimate from any set.
How many reps to build muscle?
This is where gym myths are strongest. The research picture is reassuring: muscle can grow across a very wide span of reps. When Brad Schoenfeld's group pooled the studies comparing light and heavy training in 2017, growth came out similar for both as long as sets went to failure. The heavy groups did gain more maximal strength.
So why do coaches still recommend roughly 6 to 15? Because it is the practical sweet spot:
- Below about 5 reps, each set builds muscle well but takes a lot of weight, rest and joint stress for a small amount of work.
- Above about 20 to 30 reps, sets take a long time, burn hurts, and it is hard to tell how close to failure you really are. Many people stop well before the point that counts.
- In between, you get plenty of hard reps per set, manageable fatigue and loads you can progress in small steps.
For more on what else drives growth, read our hypertrophy guide.
Rep ranges by exercise
Different exercises suit different reps. Heavy barbell lifts get technically sloppy at high reps. Small isolation lifts are hard to load heavy without cheating.
| Exercise type | Examples | Rep range |
|---|---|---|
| Heavy barbell compound | Squat, deadlift, bench press | 3 to 8 |
| Machine or dumbbell compound | Leg press, dumbbell row, incline press | 6 to 12 |
| Bodyweight compound | Pull ups, dips, push ups | 5 to 15, add weight when you pass 15 |
| Isolation, large muscle | Leg curl, leg extension, cable fly | 8 to 15 |
| Isolation, small muscle | Lateral raise, curls, calf raise | 10 to 20 |
| Core | Hanging leg raise, cable crunch | 8 to 20, or timed holds |
How many reps should I do? Pick a range, then progress
A fixed number like "3 x 10" leaves you stuck on the day you get 10, 10, 9. A range gives you room. This is the idea behind double progression:
- Choose a range of about 4 reps6 to 10 for a compound lift, 10 to 15 for an isolation lift. Wider ranges suit exercises with big weight jumps, such as dumbbells.
- Start near the bottomPick a weight you can do for the lowest number in every set with 1 to 3 reps left.
- Climb to the topAdd reps session by session until every set hits the top of the range.
- Add weight, drop back downIncrease the load by the smallest jump, and work back up. That is progressive overload in its simplest form.
Your rep range, tracked set by set
Gripp logs the reps and weight of every set and tells you the next target: last time 7 reps at 105 kg, today go for 8. Hit the top of the range in every set and the weight goes up. Gripp is coming soon to iPhone.
Join the waitlistHow many reps for strength?
Strength is partly a skill: you get better at lifting heavy by lifting heavy. That is why strength programs keep the main lifts at 1 to 5 reps. StrongLifts 5x5 uses sets of 5 throughout, while 5/3/1 cycles through 5s, 3s and singles over a month.
Most strength programs still include lighter assistance work at 8 to 15 reps. That extra muscle is what lets the heavy lifts keep moving over years, not just months.
Common rep range mistakes
- Stopping at the target number, not at effort. If you hit 12 and could have done 18, the set did less than it should. Raise the weight.
- Chasing reps with worse form. Shorter range of motion to squeeze out one more rep is not progress.
- Using one range for everything. Five reps on a lateral raise and twenty on a deadlift are both poor choices for most people.
- Changing ranges every week. Stay in a range for a full training block so you can compare sessions.