Is 4 days a week enough to build muscle?

Yes. An upper/lower split trains every muscle twice a week in only four sessions, the frequency most strongly associated with hypertrophy, while leaving three days for rest, cardio, or sport. It is the most-recommended split for busy intermediates.

Is upper/lower better for strength or size?

Both, which is why this version is programmed as powerbuilding. Each day leads with a heavy compound at RPE 8 for strength, then layers hypertrophy-biased accessory volume at RPE 9 behind it.

Which days should I train?

Any four days that give you a rest day after the two heavy sessions. A common layout is Mon/Tue then Thu/Fri. The split cares about spacing the heavy compounds, not the specific weekdays.

Upper/Lower 4-Day

A flexible 4-day upper/lower split. Balanced strength and hypertrophy with twice-weekly frequency and two rest days.

Days / week: 4
Split: Upper / Lower
Goal: Powerbuilding
Level: Intermediate

Who this is for

Busy intermediates who want strength + size with two non-negotiable rest days each week.

Expected commitment: 60-75 min per workout, 4 workouts per week.

Prerequisites: Comfortable with barbell squat, deadlift, bench, and overhead press.

Full week breakdown

Day 1: Upper A (Heavy)

Bench + row. Strength bias.

Exercise	Sets	Reps	Intensity
Barbell Bench Press	4	4-6	RPE 8
Barbell Row	4	6-8	RPE 8
Standing Overhead Press	3	6-8	RPE 8
Weighted Pull-Up	3	6-8	RPE 8
EZ-Bar Curl	3	8-10	RPE 9
Triceps Pushdown	3	10-12	RPE 9

Day 2: Lower A (Heavy)

Squat-led quad day.

Exercise	Sets	Reps	Intensity
Barbell Back Squat	4	4-6	RPE 8
Romanian Deadlift	3	6-8	RPE 8
Leg Press	3	10-12	RPE 9
Leg Curl	3	10-12	RPE 9
Standing Calf Raise	4	8-12	RPE 9
Hanging Leg Raise	3	10-15	RPE 8

Day 3: Upper B (Volume)

Incline + vertical pull. Hypertrophy bias.

Exercise	Sets	Reps	Intensity
Incline Dumbbell Press	4	8-10	RPE 8
Lat Pulldown	4	10-12	RPE 9
Seated Dumbbell Shoulder Press	3	10-12	RPE 9
Chest-Supported Row	3	10-12	RPE 9
Dumbbell Lateral Raise	4	12-15	RPE 9
Hammer Curl	3	10-12	RPE 9
Overhead Triceps Extension	3	10-12	RPE 9

Day 4: Lower B (Volume)

Deadlift-led posterior chain.

Exercise	Sets	Reps	Intensity
Conventional Deadlift	3	3-5	RPE 8
Front Squat	3	6-8	RPE 8
Hip Thrust	3	8-10	RPE 8
Walking Lunge	3	10-12 per leg	RPE 9
Seated Calf Raise	4	12-15	RPE 9
Cable Crunch	3	12-15	RPE 8

How to progress this program

Upper/Lower is the most-recommended split for intermediate lifters because it balances frequency, recovery, and time. Every muscle is trained twice a week, but you only need four gym sessions, leaving three days for rest, cardio, or sport.

The A/B wave structure keeps the heavy compound (squat, bench, deadlift, OHP) in front each day, then layers volume work behind it. Heavy day stays at RPE 8 on top sets; volume day pushes accessories to RPE 9. That combination drives both strength and hypertrophy without overlapping the same movement pattern two days in a row.

Run double progression on the working sets: stay in the rep range, and once every set reaches the top of it with form, add the smallest plate increment next session. If you come up short of the bottom of the rep range three sessions in a row, MuscleBuddy takes about 10% off that lift and you build back up from there.

The block runs four working weeks with no deload week written in. MuscleBuddy eases a week for you when your recovery scores trend down, and you can take a deload week yourself whenever you need one. Do take one: it lets accumulated fatigue, especially from deadlifts and heavy squats, clear before the next block starts.

Frequently asked questions

Is 4 days a week enough to build muscle?: Yes. An upper/lower split trains every muscle twice a week in only four sessions, the frequency most strongly associated with hypertrophy, while leaving three days for rest, cardio, or sport. It is the most-recommended split for busy intermediates.
Is upper/lower better for strength or size?: Both, which is why this version is programmed as powerbuilding. Each day leads with a heavy compound at RPE 8 for strength, then layers hypertrophy-biased accessory volume at RPE 9 behind it.
Which days should I train?: Any four days that give you a rest day after the two heavy sessions. A common layout is Mon/Tue then Thu/Fri. The split cares about spacing the heavy compounds, not the specific weekdays.

Start this program for free

MuscleBuddy auto-advances weights, tracks every set, and adjusts when you stall.

Start this program for free with MuscleBuddy