How often should you train per week? Which split fits?

How often should you train a muscle group per week?

My rule of thumb: each large muscle group about twice a week. That applies to chest, back, legs and shoulders as much as to glutes and thighs. One hard day per muscle is rarely as effective as two spread out, because frequency partly determines how long the stimulus keeps working.

How many days you need for that depends on the split. With full-body sessions, two days are enough. If you split into upper and lower body, you need four. In my judgment, 3 to 4 training days a week are enough for most people. More important than the number of days is that you actually keep them.

What the studies on training frequency show

The question has been analysed in meta-analyses several times. The first, from 2016, covered ten studies. Groups that trained a muscle more often per week gained slightly more on average (effect size 0.49 versus 0.30). Comparing one to three days per week, the authors saw two sessions per muscle as an advantage over a single one and concluded that large muscle groups should be trained at least twice a week. Whether three times is better than twice could not be settled (Schoenfeld et al., 2016).

The 2019 analysis of 25 studies is more cautious. When weekly volume was equal, there was no significant difference between higher and lower frequency, not in trained participants and not when upper and lower body were looked at separately. In studies without matched volume, higher frequencies did better, but the difference between one and three or more days per week was small. The authors conclude that for a given volume you can choose your frequency according to preference (Schoenfeld et al., 2019).

For strength, the pattern is the same. An analysis of 22 studies found larger effects with more frequent training, from 0.74 at one day to 1.08 at four or more days. With equal volume, the effect disappeared. Most of those studies used untrained participants (Grgic et al., 2018). A small single study of 20 well-trained men compared training each muscle on one day per week (split) with training the whole body on three days. Only in the forearm flexors did muscle thickness increase more on the full-body plan, and there was no difference in maximal strength (Schoenfeld et al., 2015). I count that as a hint only.

My take: frequency is secondary, and volume and proximity to failure matter more. I still stick with twice a week, for two practical reasons. Volume spread over several sessions can usually be done at better quality than volume crammed into one day, because late sets get weaker as fatigue builds. And if a session falls through, the muscle has still had a stimulus that week.

Which split fits your training days?

A split spreads your training across the week. There is no single right one. A good split is the one that fits the time you can actually take every week. That is why you set your training days first, and the split follows from them.

There should be one to two rest days between intense sessions.

Sample week: full body on three days

The example works with movement patterns, deliberately without sets and reps, and shows how they spread across three sessions. You choose the actual exercises based on equipment, technique and preference. For each muscle group, one main lift plus at most one or two more is usually enough.

Every session contains a leg pattern, a pressing pattern and a pulling pattern. That way legs and back are trained in all three sessions, and chest and shoulders several times as well. If you only have two days, fold the patterns into two sessions so that each still has a leg, a press and a pull. Then you train every muscle twice a week.

Sample week: upper/lower on four days

With four days, you divide the week into two upper-body and two lower-body sessions. Every muscle gets trained exactly twice, and each session stays shorter than a full-body day with the same weekly volume.

If your schedule allows, put the rest days between the blocks. All that matters is that there is at least one rest day between two sessions for the same muscle.

Push-pull-legs: when it pays off

Push-pull-legs separates the week into pushing, pulling and legs. It suits advanced lifters with more time, but only with a second pass per week. With a single pass, frequency per muscle group drops to once, and then you are worse off than on a full-body plan three days a week.

A simple calculation shows what this does to your volume. Say you want 12 effective sets per week for your legs. For most muscle groups I aim for 10 to 20 sets per week.

On a single legs day, all 12 sets have to happen in one session. The last ones then often come out weaker because fatigue builds. Spread over two or three days, you reach the same weekly volume with shorter leg sessions that you train fresher and cleaner.

Then there is real life: a push-pull-legs plan of which you keep only two of the planned days gets you less than a full-body plan you follow consistently. So plan with the days you realistically have.

Why progression matters more than the split

A training plan has four layers that build on each other: progression, volume, exercise selection and split. The split comes last. Without progression, even the best split does nothing, because if you move the same weight for the same reps every week, your body has no reason to keep adapting. How to increase the weight step by step is covered in the article When should you increase the weight? Progression made simple.

In practice: pick the split that fits your week and stay with it for at least eight weeks. In the first week you set the split and the main lifts. In weeks 2 to 4 you consolidate technique and write everything down. From week 5 you work with double progression and then check honestly whether your numbers are rising. The free training plan template is enough for logging. If your life changes, you change the split.