Upper/Lower Split: How to Run It on 3 or 4 Days

Upper/lower is two sessions. One covers everything above the waist, one everything below, and you run them across the week.

It is the natural step up from full body, and the split I would run if I wanted a fourth day.

Trained twice a week, each muscle gets two sessions. That keeps frequency in the range the research supports, makes each session shorter than a full body day, and leaves less to remember than push/pull/legs.

Three days gives you the upper body twice and the lower body once. That is a real choice, not a compromise, if your goal leans upper body. Train for the physique you want rather than the average recommendation.

If you run it that way, do not split the upper volume evenly across both days to be fair. Put the extra work where you want the growth.

Upper, lower, upper, lower. Every muscle twice. This is what I would recommend to most people with four days, and it keeps frequency and volume in balance without long sessions.

Aim for 8 to 15 hard sets per muscle per week. On four days that is 4 to 8 sets per session per muscle, which fits comfortably under the cap. On three days the upper body carries more of the weekly volume, so keep the extra sets on the muscles you care about.

Per-session volume for one muscle tops out around 10 to 12 hard sets. On four days that is easy: 12 weekly sets for a muscle is 6 sets per session. On three days you have to be careful, because stacking a muscle's entire weekly volume into one session is exactly what the cap prevents.

That is the rule for adding volume. Add a session before you add sets to an existing one.

Upper/lower five or six times a week keeps every session short while accumulating more weekly volume in chunks that stay under the cap. If you have the time, this is the easiest way to run high volume without junk sets.

Upper: one horizontal press, one vertical pull, one horizontal pull, one lateral raise, and one arm movement. Five exercises, three sets each.

Lower: one squat pattern, one hinge, one leg curl, one calf raise, and one core or hip movement. Same structure, same set count.

Machines and cables do most of the work. They hold the movement path, which means each set trains the target muscle instead of your ability to balance.

Upper/lower only works if the same lifts come back. Repeat the press, the row, the squat, and the hinge every week, so last week's number is a fair comparison. Swapping movements every session feels varied and tells you nothing.

Pick movements you can add weight to, which in practice means machines, cables, and smith machines for most of the work. They hold the path, so progress shows up as load rather than as balance.

Full body works best at three days. Push/pull/legs works best at five or six. Upper/lower is the only one of the three that works well at both three and four, which is why it is the safest recommendation for most people.

Three days if you are short on time and your goals lean upper body, or if you are new and still building the habit. Four days if you can commit to it and want every muscle trained twice. Both beat a six-day plan you abandon in week three.

More days will not fix a program that is not progressing. If your lifts are flat on four days, the problem is usually effort, sleep, or food before it is frequency. Fix those first.

Once four days are consistent and every muscle is recovering, a fifth upper or lower day is a reasonable way to add volume without breaching the per-session cap.

Two sessions repeated means the same lifts come back every few days. The decision is the same each time: add a rep, add an increment, or hold. GainsLog shows last session's numbers when you open the workout.