4 Day Workout Split: The Best Routines for Balanced Muscle Growth

What Is a 4 Day Workout Split?

A 4 day workout split distributes your training across four weekly sessions, giving you three rest days for recovery. This frequency hits a sweet spot for most lifters — enough training volume to drive serious muscle growth while allowing adequate recovery.

Four days per week is the most popular training frequency among intermediate and advanced lifters, and for good reason. Research shows that training a muscle group twice per week produces significantly greater hypertrophy than once per week [1], and the most effective 4-day splits accomplish exactly that.

The three most popular 4-day approaches are:

1. Upper Lower (U/L) — the gold standard 4-day split
2. PHUL (Power Hypertrophy Upper Lower) — combines strength and size work
3. 4-Day Push Pull Legs rotation — a modified PPL cycle

Who Should Use a 4-Day Split?

A 4-day split is ideal if you:

• Have been training consistently for 6+ months
• Can commit to the gym 4 days per week reliably
• Want a balance between training volume and recovery
• Are no longer progressing on a 3-day programme
• Need rest days for work, sport, or other activities

If you can train 5–6 days and want maximum volume, a 5-day split or 6-day PPL may suit you better. But for most working adults, 4 days is the practical optimum.

Option 1: Upper Lower Split (The Best All-Round 4-Day Split)

The upper lower split is the most proven 4-day approach. It divides training into upper body and lower body, each trained twice per week.

Schedule

Sample Upper Lower Programme

Upper A — Strength Emphasis:

Lower A — Squat Focus:

Upper B — Hypertrophy Emphasis:

Lower B — Hinge Focus:

Why It Works

Each muscle is trained twice per week with different exercise selections and rep ranges. The A sessions emphasise heavier, strength-focused work while the B sessions focus on moderate weights and higher reps for hypertrophy. This combination develops both strength and size simultaneously.

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Option 2: PHUL (Power Hypertrophy Upper Lower)

PHUL is a popular 4-day programme that dedicates two days to heavy, strength-focused training and two days to higher-rep hypertrophy work.

Schedule

Sample PHUL Programme

Upper Power:

Lower Power:

Upper Hypertrophy:

Lower Hypertrophy:

Best For

Lifters who want to develop both maximal strength and muscle size. PHUL is particularly effective for those coming from strength-focused programmes like 5x5 who want to add hypertrophy-specific work.

Option 3: 4-Day Push Pull Legs Rotation

This runs the PPL cycle across 4 days per week, rotating through the three sessions.

Schedule (Rotating)

Over 3 weeks, each session is performed 4 times — about 1.3× per week per muscle group. This is lower than the 2× frequency of upper lower, but provides more focused sessions.

Best For

Lifters who enjoy the PPL structure and want dedicated sessions for each movement pattern while only training 4 days per week.

How to Choose Your 4-Day Split

For most lifters: Upper Lower is the best default. It is simple, effective, and well-supported by research.

For strength athletes: PHUL provides dedicated heavy days alongside hypertrophy work.

For PPL enthusiasts: The 4-day rotation maintains the focused session structure.

Progressive Overload on a 4-Day Split

Progressive overload is what makes any split work. With 4 sessions per week, you have ample opportunity to progress:

• Compounds (3–8 reps): Add weight when you hit the top of the rep range for all sets
• Accessories (8–15 reps): Add reps first, then weight when you max out the range
• Volume: Add 1–2 sets per muscle group every 2–3 weeks when progress stalls

A workout tracker is essential — you train each exercise twice per week and need to know exactly what you did last time to beat it this time. Stronger shows your previous performance for every exercise and tracks your Strength Score across all 12 muscle groups.

Tips for Getting the Most from a 4-Day Split

Place Compound Lifts First

Start every session with your heaviest compound movement. Bench press, squat, deadlift, overhead press, and rows should always come before isolation work. You are freshest at the start of the session, and compounds require the most energy and focus.

Use the A/B Distinction

Vary exercise selection between sessions. Upper A might focus on flat bench; Upper B on incline press. This provides variety, prevents overuse injuries, and ensures balanced development across different angles and movement patterns.

Deload Every 4–6 Weeks

After 4–6 weeks of progressive overload, accumulated fatigue starts limiting performance. Take a deload week where you reduce volume by 40–50% and intensity by 10–15%. You will come back stronger [2].

Manage Your Weekly Volume

Aim for 10–20 sets per major muscle group per week. Since you are training each muscle twice, that is 5–10 sets per session. Start at the lower end and increase only when progress stalls on existing volume.

Frequently Asked Questions

Is 4 days enough to build muscle?

Yes. Four days per week provides enough volume and frequency for significant muscle growth. Research shows that total weekly volume is the primary driver of hypertrophy, and a well-structured 4-day split delivers sufficient volume for all major muscle groups [3].

Which 4-day split is best for beginners?

Upper Lower is the best starting 4-day split. It is simple to follow, provides twice-per-week frequency, and does not require complex periodisation. However, if you are a true beginner (less than 6 months of training), start with a 3-day programme first.

How long should a 4-day split workout last?

Each session should take 55–75 minutes including warm-up. Upper body sessions tend to be slightly longer (more exercises) than lower body sessions. If sessions exceed 90 minutes, reduce your exercise count.

Can I add a 5th day?

If recovery allows, you can add a 5th session focusing on weak points or lagging muscle groups. This effectively transitions you to a 5-day split. Make sure you can sustain 4 days consistently before adding a 5th.

4-day split vs 5-day split — which is better?

If you can train 5 days consistently and recover well, a 5-day split provides more volume potential. If 4 days is your reliable maximum, stick with it. Consistency beats frequency — a 4-day split performed every week outperforms a 5-day split where you regularly miss sessions.

Summary

The 4-day workout split is the most practical approach for intermediate lifters who want serious muscle growth without living in the gym. Upper Lower is the best default, PHUL adds dedicated strength work, and the 4-day PPL rotation maintains focused sessions.

Key takeaways:

• Upper Lower is the gold standard 4-day split — every muscle trained twice per week
• PHUL combines power (3–5 reps) and hypertrophy (8–12 reps) in a structured programme
• Start with 10–20 sets per muscle group per week and increase gradually
• Use double progression on all exercises — add reps, then weight
• Deload every 4–6 weeks to manage fatigue
• Track every session for progressive overload

Log your workouts and track your Strength Score with Stronger.

Build Your Best 4-Day Programme

Track your upper/lower sessions, monitor volume per muscle group, and see your Strength Score climb.

Sources

1. Schoenfeld, B. J., Ogborn, D., & Krieger, J. W. (2016). Effects of Resistance Training Frequency on Measures of Muscle Hypertrophy: A Systematic Review and Meta-Analysis. Sports Medicine, 46(11), 1689–1697.
2. Pritchard, H. J., et al. (2015). Tapering Practices of New Zealand's Elite Raw Powerlifters. Journal of Strength and Conditioning Research, 29(7), 1015–1019.
3. Schoenfeld, B. J., & Grgic, J. (2018). Evidence-Based Guidelines for Resistance Training Volume to Maximize Muscle Hypertrophy. Strength and Conditioning Journal, 40(4), 107–112.