Hypertrophy Plan

AI-built 4-day hypertrophy plan

Q: Is 4 days better than 3 days?

Yes, slightly, for intermediates and advanced. The difference is ~10-15 % additional adaptation per meta-analyses. For beginners (<12 months), 3-day Full Body is clearly superior due to fatigue management. The 3→4 day transition should happen when you've mastered the 6 main lifts (squat, deadlift, bench, OHP, row, pull-ups).

Q: Better U/L or PPL for 4 days?

U/L is clearly better for 4 days. PPL (Push/Pull/Legs) requires 6 days to be exploited correctly — in 4 days, the pattern breaks (you only do 1 day of each and frequency is 1, worse). U/L with 4 days produces clean frequency 2.

Q: How many minutes between sets?

For heavy compounds (squat, deadlift, bench, OHP): 2.5-3 minutes . For auxiliaries (row, pulldown, leg press): 90-150 seconds. For isolations (curl, raises): 60-90 seconds. Sessions perform better with proper rest — rushing it doesn't aid hypertrophy (Schoenfeld 2016).

Q: Can I combine the 4-day plan with cardio?

Yes. The plan has 3 unprogrammed days (typically Wednesday and weekend). You can do 2 Z2 cardio sessions on Wednesday and one interval cardio day on the weekend. Want more cardio? Consider the specific hybrid plan that manages interference.

Q: How long until I see results?

Visible changes: 8-12 weeks with consistency . Measurable changes (weight × reps): week 2-3. Notable aesthetic changes (hypertrophy): 12-16 weeks. Without proper nutrition (protein 1.8-2 g/kg + slight surplus), results halve — nutrition is half of progress.

Q: How often should I change the plan?

Don't change the plan, change exercise selection every 8-12 weeks . The U/L structure stays; what rotates are specific exercises (squat → front squat, flat bench → incline bench, etc.). Switching the entire plan every 4 weeks is a programming error — adaptation needs 8-12 weeks to consolidate.

Q: When should I jump to 5-6 days?

Only if you've been on 4 days for 24+ months, exhausted progression, and have time + recovery. More days isn't automatically better — most natural athletes (no hormones) maximize adaptation with 4-5 days. 6+ days is territory for bodybuilders or advanced athletes with specific supplementation and very structured lives.

Q: How much should I eat on this plan?

For hypertrophy: caloric surplus of 200-400 kcal/day above maintenance, protein 1.8-2.2 g/kg, carbs 4-6 g/kg, fat 0.8-1 g/kg. For recomposition: moderate deficit 200-300 kcal with protein 2-2.5 g/kg. Without these numbers, the plan delivers less than 50 %.

The 4-day Upper/Lower format is the sweet spot between volume and recovery: 16-18 weekly sets per muscle group, high frequency 2, 70-85 min sessions. Adaptive RIR and validated progressive overload for intermediates and advanced.

Updated September 14, 2026

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What is a 4-day hypertrophy plan?

The 4-day/week hypertrophy plan in Upper/Lower format is the natural transition from 3-day Full Body when you gain experience (>12 months training) and want more volume without saturating. Four sessions/week produce high frequency 2 — each muscle group is trained 2 times/week with good volume distribution.

Typical structure:

Upper A (Monday): horizontal push focus + vertical pull focus
Lower A (Tuesday): squat focus
Upper B (Thursday): vertical push focus + horizontal pull focus
Lower B (Friday): deadlift / posterior chain focus

Volume target is 16-18 weekly sets per muscle group — close to absolute optimum (Schoenfeld 2017), enough to maximize hypertrophy without overtraining. Sessions last 70-85 min, manageable 4×/week.

The 4 days week: what you train each day

This is the split the engine uses for 4 days: every muscle is hit twice a week (the frequency the evidence puts ahead of once), with 48-72 h between stimuli for the same group.

Mon

Upper

strength

Tue

Lower

strength

Wed

—

Thu

Upper

volume

Fri

Lower

volume

Sat

—

Sun

—

How the plan works

Your AI-generated plan

1. Upper/Lower division. Each Upper trains chest, back, shoulders, arms. Each Lower trains quads, hamstrings, glutes, calves, abs. Optimal because it lets legs recover while you train upper, and vice versa.

2. Volume and RIR.

Intermediate (12-24 months): 14-16 sets/group/week, RIR 1-2
Advanced (24+ months): 16-20 sets/group/week, RIR 0-1
Elite (4+ years): 18-22 sets/group/week (near limit), RIR 0

Frequency 2 with 16-18 sets means ~8-9 sets per group per session — optimal distribution.

3. Exercise selection. Each Upper/Lower combines:

1 heavy compound (squat, deadlift, bench, OHP) in 5-8 rep range
2-3 accessory multi-joint in 8-12 range
1-2 isolation exercises for small groups (curl, lateral raises, etc.) in 12-15 range

Critical: Upper A and Upper B are NOT identical — A emphasizes horizontal chest, B emphasizes vertical shoulder. Lower A emphasizes quads (squat), Lower B emphasizes posterior chain (deadlift). This variation produces better adaptation than repeating the same two sessions.

4. 4-week block periodization.

Weeks 1-3: load progression (ascending microcycle)
Week 4: deload -30 % volume
Every 8-12 weeks: exercise rotation for variability

5. Progressive overload. EntrenAI logs weight × reps × RIR per set and adjusts loads automatically. Typical progression for intermediates is +1.25 to +2.5 kg/week on heavy lifts during the first 8-12 weeks, slower thereafter.

Weekly sets per muscle, at this level's sweet spot

Between 10 and 16 effective sets per muscle per week: the range Schoenfeld (2017) links to more hypertrophy without exceeding what you recover from. The sets are spread across the days; chest does not fit in a single day.

Who is this plan for?

Intermediate (12-24 months training). You've mastered the 3-day Full Body plan, squat 1×BW, bench 0.75×BW. The 4-day U/L plan is your natural next step. Result: more muscle than staying at 3 days, without jumping to 5-6 days complexity.
Advanced (24+ months) recomposition. You want to gain lean mass and lose fat simultaneously. 4-day U/L with moderate caloric surplus (200-300 kcal) for 12 weeks + recomposition or cut afterwards.
Strength athlete with hypertrophy interest. Coming from pure powerlifting/strength and want more muscle without losing strength. 4-day U/L with hypertrophy block (16-18 sets, RIR 1-2) for 8-12 weeks, then return to strength.

Have <12 months experience? The 3-day Full Body plan is clearly superior — frequency 2 with less time commitment. Have 36+ months and want to maximize? Consider 5-6 day PPL plan.

The 5-week mesocycle: sets up, RIR down, then deload

Each week adds one set per muscle and leaves one rep less in reserve (RIR). In week 5 volume drops by half so the muscle grows from what was accumulated. Then the next mesocycle starts slightly higher.

Sets/muscle
RIR

Sample plan

Your first weeks, in detail

Week 4

Intermediate — 16 sets per group, RIR 1-2

Day	Session type	Detail	Duration
Monday - Upper A (horizontal focus)	Horizontal chest/back + arms	- Bench press 4×6-8 @ RIR 1 - Pendlay row 4×6-8 @ RIR 1 - Incline DB press 3×8-10 @ RIR 2 - Pull-ups 3×max (weighted if possible) @ RIR 1 - Decline DB fly 3×10-12 @ RIR 1 - EZ-bar curl 3×10-12 @ RIR 1 - Cable triceps pushdown 3×12-15 @ RIR 1	75 min
Tuesday - Lower A (quad focus)	Squat and quad accessories	- Squat 5×5 @ RIR 1 - Bulgarian split squat 3×8/leg @ RIR 2 - Horizontal leg press 3×10-12 @ RIR 2 - Lying leg curl 3×10-12 @ RIR 1 - Leg extension 3×12-15 @ RIR 1 - Standing calf raise 4×12-15 @ RIR 0-1 - Front plank 3×60 seconds	70 min
Wednesday	Rest or short Z2 cardio	Full rest or 30 min very gentle Z2 (bike or jog). No intense cardio.	0-30 min
Thursday - Upper B (vertical focus)	Vertical shoulder/back + arms	- Barbell OHP 4×6-8 @ RIR 1 - Neutral-grip lat pulldown 4×8-10 @ RIR 1 - Incline DB press 3×8-10 @ RIR 2 - T-bar row 3×10 @ RIR 1 - Lateral raises 4×12-15 @ RIR 0 - Close-grip bench 3×8-10 @ RIR 1 - Alternate DB curl 3×10-12 @ RIR 1	75 min
Friday - Lower B (posterior focus)	Deadlift and posterior chain	- Conventional deadlift 4×5 @ RIR 1 - Romanian deadlift 3×8 @ RIR 1-2 - Barbell hip thrust 4×8-10 @ RIR 1 - Front squat 3×6-8 @ RIR 2 - Seated leg curl 3×12 @ RIR 1 - Seated calf raise 3×15 @ RIR 1 - Cable crunch 3×12-15 @ RIR 1	80 min

These examples are real extracts from the EntrenAI planning engine. Your personal plan adjusts to your level, equipment and availability.

Equipment needed

EntrenAI automatically substitutes any exercise if you don’t have the gear.

Gym access with Olympic bar + plates + squat rack
Adjustable bench, varied dumbbells (5-40 kg)
High and low cable pulley, T-bar row machine
Pull-up bar + weight belt (advanced)
Lifting belt for heavy squat and deadlift
Balance pad or vibration disc for optional activation
App or notebook for load and RIR logging (essential)

Common mistakes

What most people get wrong (and how to avoid it)

1
Making Upper A and Upper B identical
Most common mistake when stepping up from 3 to 4 days. Specific adaptation comes from variation between Upper A (horizontal chest focus) and Upper B (vertical shoulder focus). If both are identical, you don't exploit frequency 2 — you only double-stimulate horizontal chest and neglect shoulder.
2
Not respecting 48 h between Lower A and Lower B
Heavy squat Tuesday and heavy deadlift Thursday doesn't respect hamstring and lumbar recovery. Minimum 48-72 hours between Lower A and Lower B. Recommended structure: Mon Upper A, Tue Lower A, Thu Upper B, Fri Lower B (Wed and Sat-Sun rest or cardio).
3
Disproportionate isolation volume
Easy to fall into 6 sets of curl and 6 sets of triceps each Upper — but arms already get indirect volume from press and pulls. 3-4 direct sets/session is enough. More isolation volume = worse recovery, no extra gain.
4
Intense cardio between sessions
Adding HIIT or Z3+ cardio between Upper A and Lower A compromises recovery. The rule: light Z2 cardio is OK (walk, easy bike); intense or middle-distance running only on Wednesday if Lower A was very heavy on Tuesday.
5
RIR always 0 on compound lifts
Squatting at RIR 0 four times a week (Lower A + Lower B) accumulates systemic fatigue that compromises the next two sessions. Alternate: heavy squat RIR 0-1 in Lower A, front squat RIR 1-2 in Lower B (or vice versa). The main compound rotates.
6
Skipping deload
Same problem as 3-day: deload every 4 weeks (-30 % volume) is where supercompensation happens. Skipping it = plateau guaranteed. After deload, weights climb more naturally and sets feel easier.
7
Too much rest between sessions
Doing Mon-Wed-Fri-Sun breaks the U/L/U/L pattern. Correct structure is e.g. Tue/Wed/Thu/Sat with consecutive days so frequency 2 works. Spreading 4 sessions across 7 days with 2-day gaps is suboptimal.

Other Hypertrophy plan variants

Back to the general Hypertrophy plan

Frequently asked questions

Yes, slightly, for intermediates and advanced. The difference is ~10-15 % additional adaptation per meta-analyses. For beginners (<12 months), 3-day Full Body is clearly superior due to fatigue management. The 3→4 day transition should happen when you've mastered the 6 main lifts (squat, deadlift, bench, OHP, row, pull-ups).

U/L is clearly better for 4 days. PPL (Push/Pull/Legs) requires 6 days to be exploited correctly — in 4 days, the pattern breaks (you only do 1 day of each and frequency is 1, worse). U/L with 4 days produces clean frequency 2.

For heavy compounds (squat, deadlift, bench, OHP): 2.5-3 minutes. For auxiliaries (row, pulldown, leg press): 90-150 seconds. For isolations (curl, raises): 60-90 seconds. Sessions perform better with proper rest — rushing it doesn't aid hypertrophy (Schoenfeld 2016).

Yes. The plan has 3 unprogrammed days (typically Wednesday and weekend). You can do 2 Z2 cardio sessions on Wednesday and one interval cardio day on the weekend. Want more cardio? Consider the specific hybrid plan that manages interference.

Visible changes: 8-12 weeks with consistency. Measurable changes (weight × reps): week 2-3. Notable aesthetic changes (hypertrophy): 12-16 weeks. Without proper nutrition (protein 1.8-2 g/kg + slight surplus), results halve — nutrition is half of progress.

Don't change the plan, change exercise selection every 8-12 weeks. The U/L structure stays; what rotates are specific exercises (squat → front squat, flat bench → incline bench, etc.). Switching the entire plan every 4 weeks is a programming error — adaptation needs 8-12 weeks to consolidate.

Only if you've been on 4 days for 24+ months, exhausted progression, and have time + recovery. More days isn't automatically better — most natural athletes (no hormones) maximize adaptation with 4-5 days. 6+ days is territory for bodybuilders or advanced athletes with specific supplementation and very structured lives.

For hypertrophy: caloric surplus of 200-400 kcal/day above maintenance, protein 1.8-2.2 g/kg, carbs 4-6 g/kg, fat 0.8-1 g/kg. For recomposition: moderate deficit 200-300 kcal with protein 2-2.5 g/kg. Without these numbers, the plan delivers less than 50 %.