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4day
BeginnerFree

4day

bodybuilding

Chin Kuan K.
Chin Kuan K.· Nov 2025
2athletes running this program
iOS & Android

Overview

Length
12 weeks
Days / week
4 days
Level
Beginner
Goal
Muscle
Equipment
Full Gym
Session length
90 min
bodybuilding

Who it's for

Beginners new to structured strength training
Athletes focused on building muscle size
Athletes who can train 4 days per week
Athletes with access to a full gym (barbells, dumbbells, cables, and machines)

Muscle engagement

Front
Back
Triceps
11.6%
Upper Back
9.7%
Hamstrings
9.3%
Quadriceps
9.3%
Chest
9.3%
Front Delts
9.3%
Biceps
7.7%
Lats
7.3%
Glutes
6.9%
Middle Delts
4.6%
Forearms
3.5%
Rear Delts
3.5%
Abs
2.3%
Calves
2.3%
Abductors
1.2%
Adductors
1.2%
Lower Back
1.2%
Week 1 Workouts
#ExerciseSetsReps
1Lying Leg Curl112 reps
112 reps
112 reps
2Leg Press (45 Degrees)112 reps
112 reps
112 reps
3Squat (Barbell)110 reps
110 reps
110 reps
4Leg Extension112 reps
112 reps
112 reps
#ExerciseSetsReps
1Bench Press (Barbell)110 reps
110 reps
110 reps
2Incline Bench Press (Dumbbell)110 reps
110 reps
110 reps
3Chest Fly (Machine)112 reps
112 reps
112 reps
4Skull Crusher (Barbell)112 reps
112 reps
112 reps
5Tricep Pushdown (Cable)112 reps
112 reps
112 reps
6Standing Calf Raise115 reps
115 reps
115 reps
#ExerciseSetsReps
1Deadlift (Barbell)110 reps
110 reps
110 reps
2Pull-Up (Neutral Grip, Weighted)112 reps
112 reps
3Wide Grip Lat Pulldown112 reps
112 reps
112 reps
4Bent Over Row (Barbell)112 reps
112 reps
112 reps
5Standing Pullover (Cable)112 reps
112 reps
112 reps
6Bicep Curl (EZ Bar)112 reps
112 reps
112 reps
7Bicep Curl (Machine)112 reps
112 reps
112 reps
#ExerciseSetsReps
1Seated Military Press (Barbell)110 reps
110 reps
110 reps
2Lateral Raise (Dumbbell)112 reps
112 reps
112 reps
3Reverse Pec Deck112 reps
112 reps
112 reps
4Shrug (Barbell)112 reps
112 reps
112 reps

Weeks 2–12 are in the app

Download Boostcamp to follow the full program with auto-progression and built-in coaching notes.

Common questions

Yes, 4day is completely free to follow on Boostcamp. Download the app on iOS or Android, find the program, and start your first workout immediately. All 12 weeks are fully unlocked.

This program is built around a full gym. Make sure you have consistent access before starting, since the progression model assumes you can perform the same movements week over week.

Each session typically takes around 90 minutes to complete. That estimate covers your working sets but doesn't account for warm-up or rest between sets, so budget a little extra time when you're first learning the movements.

4day is structured around 4 training days per week, with rest days built in to allow for recovery. The Boostcamp app lets you reschedule sessions if your week doesn't go to plan.

The program runs for 12 weeks. The structure is designed so that each week builds on the last, with weights, volume, or intensity progressively increasing as you go.

4day is available inside the Boostcamp app, free on iOS and Android. Once you download the app, you can search for the program by name. The app tracks all your sets and weights automatically, so you always know exactly what to do next session.

Get started

Boostcamp app
1,000+ free programsStrength, hypertrophy, powerlifting and more, from elite coaches. All free.
Auto-progressionWeights and targets update automatically based on how you perform.
Coaching notesBuilt-in cues from the creator inside every workout session.
Progress trackingLog every set and see your strength gains over weeks and months.
Advanced analyticsTrack volume, intensity, and 1RM trends to see exactly how your training is evolving.
Free on iOS & Android