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Colossus
IntermediateFree

Colossus

"civilize the mind, but make savage the body"

Joe S.
Joe S.· Oct 2025
2athletes running this program
iOS & Android

Overview

Length
18 weeks
Days / week
4 days
Level
Intermediate
Goal
Muscle, Strength
Equipment
Full Gym
Session length
80 min
A modified version of Alex Bromley's Bullmastiff program, which features an autoregulated 3-week wave structure. The changes I made are mostly due to exercise preferences, but there are a couple of modifications made to alleviate the crushing demand of the Bullmastiff program on my spinal erectors. To determine your weight jumps for your main lifts each week, add 1% of your 1 rep max for every additional rep in the previous week's AMRAP.

Who it's for

Intermediate athletes ready for a structured program
Athletes focused on gaining both size and strength
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
13.9%
Hamstrings
11.6%
Quadriceps
10.8%
Front Delts
10.5%
Glutes
10.5%
Abs
7.2%
Chest
6.2%
Upper Back
5.7%
Middle Delts
4.9%
Biceps
3.8%
Rear Delts
3.4%
Lats
3.4%
Lower Back
3.3%
Forearms
1.8%
Adductors
1.7%
Abductors
1.2%
Week 1 Workouts
#ExerciseSetsRepsLoad
1Bench Press (Barbell)35 reps@6.5
2Bench Press (Barbell)1AMRAP@6.5
3Overhead Press (Dumbbell)312 reps@6
Superset
4ASkull Crusher (Barbell)312–15 reps
4BPreacher Curl (EZ Bar)312–15 reps
5Rear Delt Fly (Dumbbell)312–15 reps
#ExerciseSetsRepsLoad
1Squat (Barbell)33 reps@6.5
2Squat (Barbell)1AMRAP@6
3Walking Lunge (Dumbbell)312 reps@6
4Chest Supported Row (Machine)312–15 reps
Superset
5ALeg Curl312–15 reps
5BLeg Extension312–15 reps
6Ab Wheel3AMRAP
#ExerciseSetsRepsLoad
1Overhead Press (Barbell)36 reps@6.5
2Overhead Press (Barbell)1AMRAP@6.5
3Chest Press (Machine)312 reps@6
Superset
4AOverhead Tricep Extension (Cable)212–15 reps
4BBicep Curl (Dumbbell)212–15 reps
5Rear Delt Fly (Machine)212–15 reps
#ExerciseSetsRepsLoad
1Deadlift (Barbell)36 reps@6.5
2Deadlift (Barbell)1AMRAP@6.5
3Front Squat (Barbell)312 reps@6
4Pull-Up (Assisted)212–15 reps
Superset
5ALying Leg Curl212–15 reps
5BHip Abductor (Machine)212–15 reps
6Hanging Knee Raise212–15 reps

Weeks 2–18 are in the app

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

Common questions

Yes, Colossus is completely free to follow on Boostcamp. Download the app on iOS or Android, find the program, and start your first workout immediately. All 18 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 80 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.

Colossus 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 18 weeks. The structure is designed so that each week builds on the last, with weights, volume, or intensity progressively increasing as you go.

Colossus 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

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Coaching notesBuilt-in cues from the creator inside every workout session.
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Advanced analyticsTrack volume, intensity, and 1RM trends to see exactly how your training is evolving.
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