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Cultivating The Mass In Your Ass
IntermediateFree

Cultivating The Mass In Your Ass

Simon B.
Simon B.· Jan 2026
Free on iOS & Android

Overview

Length
8 weeks
Days / week
4 days
Level
Intermediate
Goal
Women's
Equipment
Full Gym
Session length
70 min
Get thick. Get swole.

Who it's for

Intermediate athletes ready for a structured program
Athletes focused on women's
Athletes who can train 4 days per week
Athletes with access to a full gym (barbells, dumbbells, cables, and machines)

Muscle engagement

Front
Back
Glutes
13.9%
Hamstrings
12.1%
Quadriceps
11.2%
Abs
10.2%
Upper Back
7.4%
Lats
6.5%
Chest
5.6%
Adductors
5.6%
Biceps
5.6%
Front Delts
5%
Triceps
4.1%
Lower Back
3.7%
Rear Delts
2.8%
Middle Delts
2.2%
Calves
1.9%
Forearms
1.9%
Cardio
0.4%
Week 1 Workouts
#ExerciseSetsReps
1Decline Bench Press (Dumbbell)510 reps
2Lying Rear Lateral Raise110 reps
110 reps
110 reps
110 reps
110 reps
3Cable Crossover510 reps
4Lateral Raise (Dumbbell)110 reps
110 reps
110 reps
110 reps
110 reps
5Hanging Oblique Knee Raise1AMRAP
1AMRAP
1AMRAP
1AMRAP
1AMRAP
6Tricep Extension (Cable)110 reps
110 reps
110 reps
110 reps
110 reps
7Serratus punch120 reps
8Shoulder Press (Machine)115 reps
#ExerciseSetsReps
1Hip Thrust (Barbell)510 reps
2Dragon Flag510 reps
3Hip Adductor (Machine)510 reps
4Leg Extension510 reps
5Glute Kickback115 reps
115 reps
115 reps
115 reps
115 reps
6Calf Raise (Machine)110 reps
110 reps
110 reps
110 reps
110 reps
7Leg Curl510 reps
8Pull Through (Cable)115 reps
115 reps
115 reps
115 reps
115 reps
#ExerciseSetsReps
1Hip Thrust (Barbell)115 reps
115 reps
115 reps
115 reps
115 reps
2Bicep Curl (Dumbbell)110 reps
110 reps
110 reps
110 reps
110 reps
3Romanian Deadlift (Barbell)510 reps
4Pendlay Row110 reps
110 reps
110 reps
110 reps
110 reps
5Wide Grip Lat Pulldown512 reps
6Bicep Curl (Cable)510 reps
7Cable Crunch115 reps
115 reps
115 reps
115 reps
115 reps
8Seated Row (Cable)115 reps
115 reps
115 reps
115 reps
115 reps
9Standing Pullover (Cable)115 reps
115 reps
115 reps
115 reps
115 reps
#ExerciseSetsReps
1Kettlebell Swing115 reps
115 reps
115 reps
115 reps
115 reps
2Lateral Lunge (Weighted)115 reps
115 reps
115 reps
115 reps
115 reps
3Jefferson Curl110 reps
110 reps
110 reps
110 reps
110 reps
4Single Leg Romanian Deadlift110 reps
110 reps
110 reps
110 reps
110 reps
5Reverse Lunge (Dumbbell)115 reps
115 reps
115 reps
115 reps
115 reps
6Stair Climber120 min
7Hip Adductor (Machine)110 reps
110 reps
110 reps
110 reps
110 reps

Weeks 2–8 are in the app

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

Common questions

Yes, Cultivating The Mass In Your Ass is completely free to follow on Boostcamp. Download the app on iOS or Android, find the program, and start your first workout immediately. All 8 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 70 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.

Cultivating The Mass In Your Ass 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 8 weeks. The structure is designed so that each week builds on the last, with weights, volume, or intensity progressively increasing as you go.

Cultivating The Mass In Your Ass 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
Auto-progressionWeights and targets update automatically based on how you perform.
Training logLog every set and track your weights automatically each session.
Progress trackingSee your strength gains over weeks and months with built-in analytics.
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