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Flexi-Strength
IntermediateFree

Flexi-Strength

Strength program designed to move through deep ranges of motion whenever possible

C.j. Miller
C.j. Miller· Aug 2025
1athletes running this program
Free on iOS & Android

Overview

Length
6 weeks
Days / week
4 days
Level
Intermediate
Goal
Athletics
Equipment
Garage Gym
Session length
50 min
Intermediate program for strength building through full ROM. Designed to be completed with simple equipment in 45 min or less. Most benefit will come from adding accessory days of sprinting, climbing, surfing, etc.

Who it's for

Intermediate athletes ready for a structured program
Athletes focused on athletics
Athletes who can train 4 days per week
Athletes who train in a garage gym (barbell, rack, and basic free weights)

Muscle engagement

Front
Back
Front Delts
12.4%
Quadriceps
11.1%
Chest
10.3%
Glutes
10.1%
Triceps
9.8%
Upper Back
8.6%
Lats
7.9%
Hamstrings
6.8%
Middle Delts
6.3%
Biceps
3.6%
Abs
3.4%
Adductors
2.9%
Rear Delts
2.9%
Lower Back
2.4%
Calves
0.8%
Full-Body
0.8%
Week 1 Workouts
#ExerciseSetsRepsLoad
Superset
1AATG Lunge55 reps@7
1BReverse Lunge Hip Rotations520 reps@6
2Anterior Step Down320 reps@7
3Lateral Lunge38 reps@6
4Double Unders1100 reps@6
#ExerciseSetsRepsLoad
Superset
1ABench Press (Barbell)15 reps60%
15 reps70%
15 reps75%
15 reps80%
15 reps85%
1BPlyo Push up55 reps@8
2Pull-Up (Bodyweight)55 reps@7
3Pec Fly (Dumbbell)510 reps@6–8
#ExerciseSetsRepsLoad
Superset
1AHeel Elevated Back Squat55 reps@7.5
1BJump Squat55 reps@8
2Jefferson Curl310 reps@6
3Reverse Nordic Curl310 reps@7
#ExerciseSetsRepsLoad
Superset
1ASeated Overhead Press (Dumbbell)55 reps@8
1BChin-Up (Weighted)55 reps@7.5
2Lateral Raise (Dumbbell)310 reps@7
3Push Up35 reps@8
4Rear Delt Row310 reps@7.5

Weeks 2–6 are in the app

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

Common questions

Yes, Flexi-Strength is completely free to follow on Boostcamp. Download the app on iOS or Android, find the program, and start your first workout immediately. All 6 weeks are fully unlocked.

This program is built around a garage 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 50 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.

Flexi-Strength 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 6 weeks. The structure is designed so that each week builds on the last, with weights, volume, or intensity progressively increasing as you go.

Flexi-Strength 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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