Training Frequency

Overview

Frequency is the question every split is secretly answering. Choosing [push pull legs](/wiki/articles/push-pull-legs-split) over [upper lower](/wiki/articles/upper-lower-split) is not really a choice about names; it is a choice about how many times a week each muscle gets trained.

The evidence here is unusually interesting, because the two best meta-analyses reached different answers and the second one explains the first.

Key Points

• With volume equated, frequency has little independent effect.
• Higher frequency wins when it is how you get more volume in.
• Twice a week per muscle is the practical default for most people.
• Once a week is not a mistake if the volume is there.
• Very high frequency is a preference, not an advantage.

The two meta-analyses

2016. Comparing studies that trained muscle groups one to three days a week on a volume-equated basis, the evidence indicated that training twice a week promoted superior growth to once a week. That finding is where "hit each muscle twice a week" came from, and it was a reasonable reading of what existed then.

2019. A larger analysis of 25 studies found no significant difference between higher and lower frequency once volume was equated — including when only direct measures of muscle growth were used, only trained lifters, and upper and lower body separately. The conclusion was that for a given training volume, you can pick a weekly frequency by preference.

The same analysis found something that matters just as much: among studies that did not equate volume, higher frequency did win, though the difference between training once and three or more times a week was modest.

So what does frequency actually do

It is a delivery mechanism for volume, not an independent driver.

Suppose a muscle needs 16 hard sets a week. You can:

All three can work. The second is easier to execute well, which is why it is the sensible default — not because a muscle has a 48-hour timer on it.

The honest version of the advice is: train each muscle often enough that the sets you need fit into sessions you can actually complete well.

Practical defaults

See [how to choose a routine](/wiki/articles/how-to-choose-a-routine) for the split that delivers these.

Where higher frequency genuinely helps

• -Skill. Lifts you are still learning improve with more practice. A technique-limited squat benefits from squatting three times a week even if the muscle does not care.
• -Volume you cannot otherwise fit. If 20 sets of back is the target, five sets on four days beats twenty sets on one.
• -Strength work. Frequent, submaximal practice of a competition lift is standard in [strength programming](/wiki/articles/strength-programming-basics) for precisely this reason.
• -Fitting life. Four short sessions may be more achievable than two long ones.

Where it does not

• -As a substitute for volume. Six sessions a week of three sets is still not much work.
• -As a substitute for progression. See [progressive overload](/wiki/articles/progressive-overload).
• -For small muscles that recover fast anyway. Calves and abs tolerate frequency; that does not mean they need it.

Common Mistakes

Frequently Asked Questions

How often should I train each muscle?

Twice a week is the practical default, mainly because it makes the weekly volume easier to complete well. Once or three times can work if the volume is right.

Is training a muscle once a week enough?

It can be, if the weekly volume is there. The problem is that fitting a muscle's whole week of work into one session usually means the last sets are poor.

Does higher frequency build more muscle?

Not by itself. Once total volume is held equal, frequency shows no meaningful independent effect. It helps when it is the way you get more volume done.

What about training a muscle every day?

There is no evidence it beats a sensible frequency at matched volume, and it makes [rest](/wiki/articles/rest-between-sets) and recovery harder to manage. It is a preference, not an edge.