Repetitions, sets, and rest intervals are the basis of strength training programs. Understanding what each is and how to maximize them will help you reach your fitness goals.
Your weight training program will differ in the weights used, number of repetitions and sets, rest intervals, and speed of execution depending on whether you are training for fitness, muscle growth, strength, power, or endurance.
Reps, Sets, Rest, and Speed
The first step is understanding reps and sets and how they apply to your workout program. A repetition, or rep, references one complete movement. So, one biceps curl equals one rep, and 5 biceps curls are 5 reps.Reps make up a set, which is usually the total number of reps you'll do before taking a break. You'll find more details on reps, sets, rest, and speed below.
Reps
A rep is one completion of an exercise, such as one deadlift, one bench press, or one arm curl. A repetition maximum (1RM) is your personal best or the most you can lift once in a single repetition of an exercise. Therefore, a 12RM is the most you can lift and successfully perform 12 repetitions with proper form. As with any rep-based weight lifting exercise, be sure to improve your grip by using a quality lifting chalk.
Sets
A set is a collection of repetitions performed sequentially. For example, eight repetitions can be oneset of bench presses.
Rest Intervals
A rest interval is time spent resting between sets that allow muscles to recover. The rest period between sets may range from 30 seconds to two minutes. Some exercises also have short rests between reps.
The ideal rest period depends on your goals. Muscle hypertrophy, or muscle building and growth, may require less rest than powerlifting, for example.
- Muscle hypertrophy:30 to 60 seconds
- Muscle endurance:30 to 60 seconds
- Power:1 to 2 minutes
- Strength:2 to 5 minutes
It's important to time your rest between sets. If you don't rest long enough and start with another set too soon, you may fatigue your muscles too quickly and risk injury. If you rest too long between reps, your muscles may begin cooling down and releasing tension before you start again.
Sample Exercise Plan
Barbell Overhead Press:50 pounds, 3 X 10 RM, 60 seconds
This means you do three sets of up to 10 presses, using a weight of 50 pounds, with 60-second rests between sets.
Speed of Exercise Execution
Contraction velocity is the speed at which one rep of an exercise is performed. This has an effect on training goals and results. Both concentric (shortening of the muscle; often the lifting part of a rep) and eccentric (lengthening of the muscle, often the lowering part) moves help to build muscle mass.
- Strength: 1 to 2 seconds concentric and eccentric
- Hypertrophy: 2 to 5 seconds concentric and eccentric
- Endurance:1 to 2 seconds concentric and eccentric
- Power:Less than 1 second concentric, 1 to 2 seconds eccentric
How to Choose Weights
The theoretical distribution of repetitions against a percentage of 1RM (your maximum lift) is as follows. This example uses a bench press where your 1RM is 160 pounds.
- 100% of 1RM: 160 pounds, 1 repetition
- 85% of 1RM: 136 pounds, 6 repetitions
- 67% of 1RM: 107 pounds, 12 repetitions
- 65% of 1RM: 104 pounds, 15 repetitions
- 60% of 1RM: 96 pounds, warm-up reps
You should be able to do one lift at your personal best, six lifts at 85% of your personal best, and 15 lifts at 65% of your 1RM personal best. This is a guide you can refer to when you choose appropriate weights for working out.
Best Dumbbell Racks, Recommended by a Personal Trainer
Using Goals to Build a Workout Program
A training program is a schedule of exercise types, frequency, intensity, and volume, whether for weights or other fitness training. You can devise many combinations of reps, sets, rest, and exercise types to find what works best for you. A qualified strength and conditioning trainer can help you plan a program.
These variables can be adjusted in any weight training program:
- Exercise selection
- Weight or resistance
- Number of repetitions
- Number of sets
- Velocity of movement
- Rest time between sets
- Rest time between sessions (training days/week)
- Time between periodization cycles
Training for General Fitness
A basic strength training fitness program should target both strength and muscle-building. Between eight and 15 repetitions for twoto four sets will help you accomplish both.
Choose eight to 12 exercises, making sure to hit your lower and upper body and core. At this stage, don't lift too heavy or too light (you should feel fatigued by the last rep, but it shouldn't be overly difficult) to ensurea good foundation before trying more goal-specificworkouts.
Training for Strength
Building strength entails using the most weight, the least number of reps, and long rest periods. The neuromuscular system responds to heavy weights by increasing your ability to lift those big loads.
For example, those with a strength goal might use a 5x5 system. That means five sets of five repetitions. You'll use relatively higher loads (heavier weights), plus take a longer rest between sets (about three to five minutes).
Training for Muscle Growth
Hypertrophy formuscle size and bodybuilding training uses lighter weights, more repetitions and less rest time. Muscle requires metabolic stress to increase in size. This means working the muscle to the point where lactate builds and muscle suffers internal damage, then resting and eating appropriately to help the muscle repair. The muscle grows larger in the process.
This sort of training requires a higher number of repetitions in each set in order to stimulate that breaking point. It is sometimes called "training to failure."
A typical approach to reps and sets for those looking to build muscle might be three sets of eight to 12 reps, at loads that reach failure point (or near) on the last few repetitions.
Training for Power
Power training involves somewhat lighter weights and longer rests while concentrating on the speed of execution. "Power" is the ability to move an object quickly. Power training requires practicingthe accelerationpart of alift, then resting and repeating.
In power training, you lift moderately heavy weights, accentuate the concentric first movement of the exercise, then rest sufficiently to recover before completing that rep or set again. You need to ensure each push,pull, squat, or lunge is done at a quick tempo.
Training for Muscular Endurance
Endurance weight training requiresmore repetitions in each set, perhaps up to 20 or 30, with lighter weights. You may want to consider why you set this as your goal. What is the day-to-day function that requires muscularendurance? For example, if you're a runner, you might want to concentrate on endurance in your legs. Swimmers might focus on their arms.
Training for Olympic Lifts
Olympic lifting requires strength and power. Olympic lifters train to do just two lifts: the clean and jerk and the snatch. Training sessions include six or fewer repetitions for a higher number of sets, about 10 to 12. The goal here would be to get better and stronger at these particular movements, and also increase the weight used in the exercises.
1 Source
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National Strength and Conditioning Association. Training load chart.
By Paul Rogers
Paul Rogers is a personal trainer with experience in a wide range of sports, including track, triathlon, marathon, hockey, tennis, and baseball.
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