If you’ve ever looked at a workout plan and seen something like “3×8” or “5×5” and had no idea what it meant, you’re not alone. Understanding sets vs reps is the foundation of any weight training program, and once you understand them, reading any workout becomes simple. This guide breaks it all down.
Sets vs Reps: What Are They?
A rep (short for repetition) is one complete movement of an exercise. Squat down and stand back up, that’s one rep.
A set is a group of reps done back to back without stopping. Do 8 squats and then rest, and you’ve completed one set of 8 reps.
That’s the “3×8” notation decoded: 3 sets of 8 reps. You do 8 reps, rest, repeat until you’ve done all 3 sets. Sometimes you’ll also see the weight included: “3x8x80kg” means 3 sets of 8 reps with 80kg.
What Rep Ranges Actually Do
The number of reps you do per set influences what kind of adaptation your body prioritizes, but it’s not the whole story. Here’s what each range is generally best at.
1 to 5 reps — strength
This is the rep range powerlifters live in. Low reps with heavy weight train your nervous system to produce force more efficiently. You’re not just building muscle, you’re teaching your body to use the muscle you already have more effectively. Programs like StrongLifts 5×5 and Starting Strength are built on this principle.
6 to 12 reps — muscle growth
This range is the most practical for hypertrophy. The weight is heavy enough to challenge the muscle but light enough to accumulate volume across multiple sets. Most bodybuilding programs sit here, and it has enough carryover to strength that powerlifters often use this range for accessory work.
15+ reps — muscular endurance
Higher reps with lighter weight primarily build the muscle’s ability to sustain effort over time, but research shows they can stimulate muscle growth too, as long as sets are taken close to failure. Less common as a primary approach for size, but far from useless.
That said, these ranges are guidelines rather than rigid rules. A 2021 meta-analysis by Schoenfeld et al. found that muscle can grow across a wide rep range, as long as sets are taken close to failure. For beginners, sticking to the ranges above is still a reliable starting point.
How Many Sets Per Exercise?
For most exercises, 3 to 5 sets is a sensible starting point. Less than that and you may not be doing enough to stimulate progress; much more and you’re likely just accumulating fatigue without added benefit.
Rest Between Sets
Rest between sets is something beginners often underestimate. Too little rest and your performance drops set to set, which defeats the purpose of the structure you’ve set up with your sets and reps.
For strength work in the lower rep ranges, 2 to 5 minutes is appropriate. You’re lifting heavy and need your nervous system recovered before the next effort. For muscle growth focused work, anywhere from 1 to 3 minutes works for most people, though longer tends to be better than shorter. A 2016 study by Schoenfeld et al. found that 3 minute rest periods produced greater gains than 1 minute.
A Simple Example
To put it all together, here’s what a basic lower body session might look like:
Squat — 3×5 3 sets of 5 reps with a heavy weight, 3 to 5 minutes rest between sets.
Romanian Deadlift — 3×8 3 sets of 8 reps with a moderate weight, 2 minutes rest between sets.
Leg Extension — 3×10 3 sets of 10 reps with a lighter weight, 1 to 2 minutes rest between sets.
Each exercise uses a different rep range, but the sets and reps notation is the same throughout. Once you understand what 3×5 means, you can read any program.
FAQs
Conclusion
Sets and reps are the foundation of any weight training program. Once you understand what they mean and how they interact, reading a workout program becomes straightforward and planning your own training gets a lot easier.
As a beginner, don’t overthink it. Pick a rep range that matches your goal, do 3 to 5 sets per exercise, rest long enough to perform well on each set, and focus on adding weight to the bar over time. That’s really all there is to it.
Once you’ve got your sets and reps dialled in, understanding when to deload is the next thing worth looking into.
