The best split isn't the fanciest one. It's the one that trains everything enough, fits your week, and you'll actually repeat. For most people, that's an upper/lower.
What is the 4-day upper/lower split?
It's four sessions a week — two upper-body days and two lower-body days — arranged so no region is trained on back-to-back days. It hits every major muscle group at least twice a week, which tends to beat once-weekly for growth, while keeping each session short enough to finish with quality.
The weekly layout
A common arrangement is Monday, Tuesday, Thursday, Friday:
| Day | Session | Leads with |
|---|---|---|
| Monday | Upper A | Horizontal push + horizontal pull + vertical push |
| Tuesday | Lower A | Squat pattern + hinge pattern |
| Thursday | Upper B | Vertical pull + horizontal push + horizontal pull |
| Friday | Lower B | Hinge pattern + squat pattern |
Upper A leads with pressing; Upper B leads with pulling. Lower A leads with the squat; Lower B leads with the hinge. That rotation balances your pushing and pulling and your quads and hamstrings across the week — no single pattern gets neglected.
What a session looks like
Hang your exercises on the movement patterns, then set sets and reps to your goal. A size-focused Lower A might read: a main squat pattern for 3–4 sets, a hinge for 3–4 sets, a split squat for 3 × 10–12 each leg, plus calves and core. Choose the loads with progressive overload and the volume with weekly hard sets.
Scaling to 2, 3, or 5 days
- 3 days: rotate Upper A / Lower A / Upper B one week, Lower B / Upper A / Lower A the next. Everything still gets trained; frequency floats around 1.5×/week.
- 2 days: run two full-body sessions built from the same patterns — a great minimum that still drives progress.
- 5 days: add an arms-and-weak-points or conditioning day, but guard recovery.
Don't start every session cold — a few focused minutes of prep makes your first heavy set feel better. Here's how to warm up before lifting.
The 3-day and 2-day versions, written out
Fewer days doesn't mean a worse plan — the same patterns just get rearranged.
3-day (alternating):
- Week A: Mon Upper A · Wed Lower A · Fri Upper B
- Week B: Mon Lower B · Wed Upper A · Fri Lower A
Everything still gets trained, with frequency floating around 1.5× per week.
2-day (full body): two sessions, each built from a squat or hinge, a push, a pull, and some core — e.g. Mon and Thu. It's the honest minimum that still drives progress if you show up and apply overload.
Frequently asked questions
Is upper/lower better than a bro split? For most non-advanced lifters, training each muscle twice a week (upper/lower) tends to out-produce once-a-week body-part splits, and it's more forgiving if you miss a day.
Can beginners run a 4-day split? Yes, if you can commit to four sessions. If not, the 2- or 3-day version of the same plan is better than an ambitious schedule you abandon.
Where does cardio fit? On a separate day from heavy legs, or after lifting. See how much cardio for fat loss.
This is the skeleton. The System writes out every day in full — Upper A, Lower A, Upper B, Lower B — with dial settings per goal and a full exercise library. The full framework — the goal dials, the 4-day template, the exercise library with home substitutions, and the nutrition section — lives in The Adaptable Strength & Conditioning System, a $19 digital guide (reg. $29). It's education, not a prescription: it carries a health disclaimer and assumes you'll train sensibly.
See the whole Fitness & Nutrition collection.