What 3x10 and 4x8 actually mean in a training plan

Your programme says squat 3x10, bench press 4x8, row 3x12, and the first question is always the same: which number is which, and why does one exercise get ten reps while the next gets eight. The notation takes a sentence to explain. What sits behind it is what decides whether you actually get anywhere over the next few months.

The first number is sets, the second is reps

In almost every programme you will meet, the first number is the number of sets and the second is the number of repetitions in each set. 3x10 means three sets of ten reps, thirty reps in total. 4x8 means four sets of eight, so thirty-two.

A rep is one complete movement, down and back up again. A set is an unbroken run of reps, from the moment you take the weight to the moment you put it down. Between sets there is a rest, and although it rarely appears in the notation, it matters as much as the numbers do.

Warm-up sets don't count. If the plan says 3x10 on squats, that is three working sets at your working weight; the lighter sets before them are preparation, and there might be two of them or five depending on the day. What those first minutes should look like is covered in our piece on warming up in the first ten minutes.

Why 3x10 and 4x8 do much the same job

Thirty reps against thirty-two is a difference of about seven per cent in total work. The weight on the bar in a set of eight is usually a little heavier, because eight reps are easier to hold together than ten. For anyone in their first year of training, the two prescriptions are close to interchangeable.

Research generally points the same way: muscle grows similarly across a wide span of rep ranges, roughly five to twenty-five per set, as long as the sets are taken close enough to failure. Strength is a different matter. It responds best to heavier loads and low reps, somewhere around three to five per set.

The practical difference comes down to two things. A fourth set adds a few minutes and a bit more fatigue to the session, and eight heavier reps are harder to keep technically clean. That is why beginner plans lean towards 3x10 rather than 4x8, not because ten is a special number.

Ranges, 5x5 and notation that runs backwards

You will often see a range: 3x8–12. Three sets, and you pick a weight that lets you manage at least eight but no more than twelve. The range is not the coach hedging. It is the room you have to improve in before you touch the plates.

5x5 is the tidy case — five sets of five, no ambiguity, both numbers the same. 10x3 is clearer than it looks too: ten sets of three, a standard strength layout. As a rule, when one number is small and the other is large, the small one is the reps and you are looking at a strength block rather than a muscle-building one.

Some plans, particularly ones translated between languages, do flip the order. Context settles it: the prescription usually carries a weight or a rest period alongside it, and 3x10 with a 60-second rest is obviously not ten sets. The same line often carries abbreviations such as RM, AMRAP or a tempo code, which we've unpacked in the guide to the shorthand that turns up in training plans.

What the notation leaves out — and it's the important part

3x10 tells you nothing about effort. Ten reps with a weight that is far too light is a warm-up, not a set. The working rule for most people: the last two or three reps should be genuinely hard, and you end the set with roughly one to three reps still in reserve.

Getting to that weight without guesswork is a subject of its own — we've set it out step by step in the piece on choosing the weight for your first set, and there's a separate one on working out what to load on the bar.

The other omission is rest. For the big lifts — squat, deadlift, press — two to three minutes is realistic. For isolation work, 60 to 90 seconds is plenty. If your reps collapse from ten to six by the third set, suspect a short rest before you blame the weight.

Turning 3x10 into progress

The simplest system is double progression: add reps first, weight second. On a 3x8–12 plan you start with a load you can lift eight times in all three sets. Next session you aim for nine, then ten, and when you hit twelve in every set you add weight and drop back to eight.

Keep the jumps small — 2.5 kg on upper-body lifts, 5 kg on leg work, and use the 0.5 or 1.25 kg plates if the gym has them. Dumbbells often move in 2 kg steps, which on an incline press can be too much at once; add reps first in that case.

For muscle growth, the weekly number of sets per muscle group matters more than whether a given day was 3x10 or 4x8. Six to ten sets a week per group, spread over two or three sessions, is plenty to begin with. Write down your weights and reps: without a log, progression turns into a feeling, and feelings are unreliable.

When to see a doctor

Being sore for a day or two after a new programme is normal. Get checked if you have sharp pain tied to one specific movement, pain lasting more than a week, numbness or weakness in an arm or leg, a swollen joint, or chest tightness, dizziness or breathlessness during a set. If you have a known heart condition, high blood pressure, recent surgery, or you are pregnant, speak to a doctor before you start loading up.

The short version

• First number sets, second number reps: 3x10 is three sets of ten, thirty reps in total.
• 3x10 and 4x8 produce very similar results — the gap in total work is around seven per cent.
• A range like 3x8–12 means start at eight and add weight only once you hit twelve in all three sets.
• The notation says nothing about load or rest, which is what actually drives the result; the last two or three reps should be hard.
• Warm-up sets are not part of the 3x10 — those are three working sets.