20 minute AMRAP
The Fortress
Hold and surge · Armor Protocol · intensity 4 of 5
The workout
As many rounds as possible in 20 minutes of:
- 20s Superman Hold
- 10 Commando Planks
- 20 Reverse Lunges
- 20 Butt Kicks
Overview
The Fortress is a 20-second superman hold, 10 commando planks, 20 reverse lunges, and 20 butt kicks. The round opens with a 20-second superman hold. Doing the commando planks still comes after it, not as a rest earned by the hold.
Muscles worked
Full body
Glutes
Midline
Quads
Upper back
Superman Hold
Energy systems
These are overlapping contributions. This workout is not assigned to one energy system.
- Glycolytic: Moderate
- Oxidative: Moderate
- Neuromuscular: High
Training effect
Immediate demand
20 minutes, intensity 4 of 5. Today the limiter is the superman hold before the commando planks.
Intended stimulus
The style is built so every round starts with a hold and then moves. On this workout that is a 20-second superman hold, 10 commando planks, 20 reverse lunges, and 20 butt kicks.
Repeated practice
Repeat the same workout and compare the score. What can change over weeks is how long that pace lasts. One time through does not produce that change.
Body-composition context
Body weight changes with the rest of how you eat and train. This workout is one piece of work on one day.
Expected feel
The hold is the start of the round. The next movement still has to be done after it, not as a rest earned by the hold.
Pacing
The Superman hold locks the posterior chain, providing a rigid foundation for the heavy lunges that follow.
Do not shorten the superman hold to reach the commando planks. The hold is the start of the round. The next movement still has to be done after it.
The movements
Superman Hold
Aggressively squeeze the glutes before you lift the chest to protect the lower back from absorbing all the force.
What not to do. Holding with only the chest raised and the thighs still down.
Commando Planks
Widen your feet. A wider base of support kills the rotation in the hips, making the core work harder but the movement faster.
What not to do. Always leading with the same arm, so one shoulder does most of the work.
Reverse Lunges
Keep your torso completely upright. Leaning forward shifts the load to the lower back and robs the quads of the intended tension.
What not to do. Stepping back too short, which forces the front shin to angle over the toe.
Butt Kicks
Lean slightly forward from the ankles (not the waist) to maintain an aggressive, forward-driving posture even while stationary.
What not to do. Kicking the heels out behind rather than straight up to the glutes.
Why these movements
The round opens with a 20-second superman hold. Doing the commando planks still comes after it, not as a rest earned by the hold.
Scaling
Keep the hold and the moving piece together. Shorten the hold and the reps together so the round is still a hold followed by work.
Superman Hold
- Shorter range. Lift only as high as you can hold the position without arching the back.
- Both legs. Drive through both feet instead of one.
Commando Planks
- From the knees. Knees down, straight line from knees to shoulders.
- Hands elevated. Hands on a bench or step. The higher the surface, the less you carry.
Reverse Lunges
- Hold a support. One hand on a wall or chair for balance. The legs still do the work.
- Shorter range. Drop only as far as you can stand back up from without pushing off your hands.
Butt Kicks
- Low impact. Keep one foot down throughout — march the pattern instead of running it.
- Slower cadence. Same movement, fewer beats per minute. Cadence is the dial, not the shape.
Mistakes and who it is for
- Opening the superman hold at a sprint makes the superman hold the piece that falls apart.
- Cutting the superman hold short to reach the commando planks removes the hold the round starts with.
- Spending the first minutes hard leaves the later rounds as a different, slower workout.
Suited to someone who wants 20 minutes through Superman Hold, Commando Planks, Reverse Lunges, Butt Kicks.
Scoring and progression
Work through the movements in the order listed, then start the next round. Your score is the number of complete rounds plus any reps of the round you were partway through when the clock hit zero — written as rounds plus reps, so seven full rounds and twelve reps is7+12.
Progression is repeating this workout and comparing that score. The page does not promise a change from one time through.
Related workouts
- The Suspended Scapula
Same upper back and midline, same clock
- Global Retraction
Same upper back and midline, shorter clock
- Iron Scapula Grind
Same upper back and midline, shorter clock
Run it with friends
The Fortress runs on a shared countdown: share a rally link, everyone gets the same 20-minute clock, and the leaderboard updates as people log rounds.