Most workout plans fail before the first session because they ask for a life you do not have. Six days a week sounds committed until work runs late twice in a row. A 4-day upper/lower split is the opposite idea: two days for the upper body, two for the lower body, and enough rest that a normal week can absorb it. Done consistently, it covers every muscle twice a week, which is what actually drives growth.
How to build a 4-day upper/lower split that you will actually stick to
Training · 17 October 2026
What an upper/lower split is
You divide training by body half instead of by muscle. Upper day trains chest, back, shoulders and arms in one session. Lower day trains quads, hamstrings, glutes and calves. Instead of one "chest day" that fries a single muscle and ignores it for a week, each muscle gets worked twice weekly with days to recover in between.
The 4-day week, laid out
A week that survives real schedules looks like this:
- Monday - Upper A: bench press or push-up variation, a row, overhead press, lat pulldown or pull-up, one curl and one triceps movement.
- Tuesday - Lower A: squat pattern, Romanian deadlift, leg press or lunges, leg curl, calf raises.
- Thursday - Upper B: incline press or dips, pull-ups or pulldown, dumbbell shoulder press, a row variation, arms again.
- Friday - Lower B: deadlift or hip thrust, front-foot-elevated split squat, leg extension, leg curl, calves.
Wednesday, Saturday and Sunday are rest or light walking. If your week only allows Monday-Tuesday-Thursday-Saturday, that works too. The rule that matters: never stack more than two training days in a row, and keep at least one full rest day after a lower day.
How many sets per muscle
For most people, 2 to 4 hard sets per exercise is plenty. Across the week that lands at roughly 8 to 14 sets per muscle group, which sits comfortably inside what research supports for growth. More is not better if the extra sets are sloppy. Take each working set close to the point where one or two good reps remain, and stop there.
How to progress without burning out
Pick a rep range per lift, say 6 to 10 for presses and rows, 10 to 15 for curls and leg work. When you hit the top of the range on every set with clean form, add a small amount of weight next session and build back up. That is the whole progression system. Log every session, because "I think I did 60 last time" is where progress goes to die. An app that remembers your last weights, like FitHit's workout tracker, turns this into a two-second check instead of a memory test.
Can I run it on any four days?
Yes, as long as two upper days and two lower days each land in the week and you avoid three consecutive training days. Shift days around work and family; consistency of the pattern matters more than the calendar.
What if I miss a day?
Slide the week, do not double up. Missed Friday's Lower B? Do it Saturday and start the next week a day later. Two squeezed sessions in one day recover worse than one moved session.
How long should each session take?
With 2 to 3 minute rests on big lifts and shorter rests on small ones, 60 to 75 minutes is realistic. If you are past 90 minutes, you are resting too long or doing too many exercises.
