The Upper/Lower Split: Balanced Four-Day Training
Split your week into two upper-body and two lower-body days and you hit every muscle twice — the frequency research links to the best growth. Here is a complete upper/lower routine.
- An upper/lower split divides the week into two upper-body and two lower-body days.
- It trains each muscle twice a week — the frequency research links to slightly better growth.
- It fits a 4-day schedule cleanly and can be compressed to 3 days by rotating.
- Open each day with a heavy compound (4–6 reps) for strength, then accessories (8–15) for size.
- A great next step once a beginner outgrows full-body training.
Once a simple full-body routine stops giving you enough room to add volume, the natural next step is a split — and the upper/lower split is the most balanced one there is. You train your upper body twice and your lower body twice each week. That hits the sweet spot the research points to: each muscle stimulated roughly twice every seven days, with enough volume per session to grow and enough recovery between to repair.
This guide gives you a complete upper day and lower day, two schedules (four-day and three-day), and the rep-range logic that lets you build strength and size at the same time.
Why frequency of two beats one
A well-known body of research, summarised in several meta-analyses, suggests that when total weekly volume is equal, spreading your sets across two sessions per muscle tends to produce slightly more growth than doing them all in one. The likely reason is that each training bout elevates muscle-protein synthesis for roughly a day or two; training a muscle twice a week keeps it elevated more often, so you spend more total time building.
The upper day
Each upper day trains chest, back, shoulders and arms. Run it twice a week; you can keep both days identical or vary the second one slightly (for example, swap a flat press for an incline press) to hit muscles from new angles.
| Exercise | Sets × Reps | Focus |
|---|---|---|
| Bench or incline press | 4 × 5–8 | Strength / chest |
| Row (barbell or cable) | 4 × 6–10 | Back thickness |
| Overhead press | 3 × 6–10 | Shoulders |
| Lat pulldown or pull-up | 3 × 8–12 | Back width |
| Lateral raise | 3 × 12–15 | Side delts |
| Curl + triceps superset | 3 × 10–15 | Arms |
Need movement ideas? See our libraries for the chest, back, shoulders and arms.
The lower day
Each lower day trains quads, hamstrings, glutes and calves, plus some core. As on the upper day, you can keep the two lower days the same or make one squat-focused and the other hinge-focused.
| Exercise | Sets × Reps | Focus |
|---|---|---|
| Squat | 4 × 5–8 | Strength / quads |
| Romanian deadlift | 4 × 6–10 | Hamstrings / glutes |
| Leg press or lunge | 3 × 10–12 | Quads / glutes |
| Leg curl | 3 × 10–15 | Hamstrings |
| Calf raise | 4 × 12–20 | Calves |
| Hanging leg raise / plank | 3 × 12–15 or 45 s | Core |
Four-day and three-day schedules
The classic version uses four training days with the two upper and two lower days separated for recovery:
| Mon | Tue | Wed | Thu | Fri | Sat/Sun |
|---|---|---|---|---|---|
| Upper | Lower | Rest | Upper | Lower | Rest |
If you can only train three days a week, rotate the four sessions across the days so over two weeks you still average each muscle twice weekly:
| Week | Mon | Wed | Fri |
|---|---|---|---|
| 1 | Upper | Lower | Upper |
| 2 | Lower | Upper | Lower |
Keep the first compound of each day heavy (around 4–6 reps) to build strength, then push the accessories into the 8–15 range closer to failure for growth. This blend is what makes the upper/lower split so versatile.
Is the upper/lower split right for you?
It is an excellent choice if you can train four days a week and have a few months of consistent lifting behind you. Pure beginners often progress just as well on a simpler full-body routine first, then move here when they need more volume. If you prefer training five or six days, a push/pull/legs split scales better. Whichever you choose, anchor it to progressive overload, fuel it with enough protein, and protect your recovery.
Sources & further reading
- PubMed — Training frequency and muscle hypertrophy (meta-analysis)
- NSCA — Designing Resistance Training Splits
- ACSM — Resistance Training Frequency & Volume
- ACE — Training Split Design
External links are provided for reference and do not imply endorsement. arsenal.fit is an independent publisher and is not affiliated with any cited organisation.