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20 minute AMRAP

The Iron Yoke

Hold and surge · Armor Protocol · intensity 5 of 5

The workout

As many rounds as possible in 20 minutes of:

Overview

The Iron Yoke is a 20-second hollow hold, 12 back widow, 15 combat sprawls, and 20 fast calf raises. The round opens with a 20-second hollow hold. Doing the back widow still comes after it, not as a rest earned by the hold.

Muscles worked

Energy systems

These are overlapping contributions. This workout is not assigned to one energy system.

This workout departs from its style on the profile below.

  • Glycolytic: High
  • Oxidative: Moderate
  • Neuromuscular: High

Training effect

Immediate demand

20 minutes, intensity 5 of 5. Today the limiter is the hollow hold before the back widow.

Intended stimulus

The style is built so every round starts with a hold and then moves. On this workout that is a 20-second hollow hold, 12 back widow, 15 combat sprawls, and 20 fast calf raises.

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

Hollow into widows before sprawls and calves finish the armor grind. Brace hard — do not dump the hollow early.

Do not shorten the hollow hold to reach the back widow. The hold is the start of the round. The next movement still has to be done after it.

The movements

Hollow Hold

Fatigue causes the back to arch. Regress the movement immediately by tucking your knees toward your chest when this happens.

What not to do. Letting the lower back arch away from the floor as the legs tire.

Back Widow

Do not turn this into a core crunch. Your lower back and glutes must stay anchored to the floor. The only reason your torso lifts is because your lats and rhomboids are pressing the earth away.

What not to do. Turning the lift into a crunch so the lower back and hips leave the floor.

Combat Sprawls

You must land with your entire foot completely flat on the mat when returning from the plank. Landing on your toes in this wide stance places severe shearing force on the knee capsule and kills your ability to rebound.

What not to do. Landing the feet inside the hands, leaving no room to lift the chest.

Fast Calf Raises

As the calves fill with lactic acid, your body will naturally try to shorten the range of motion. Fight for maximum height on the 20th rep just like you did on the 1st rep.

What not to do. Cutting the lift short, so the heels never reach full height.

Why these movements

The round opens with a 20-second hollow hold. Doing the back widow 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.

Hollow Hold

  • Knees bent. Bend the knees to shorten the lever. The shorter it is, the lighter it is.
  • Partial range. Move only through the range where you can keep the lower back on the floor.

Back Widow

  • Shorter lift. Drive into the floor but only lift as high as you can control without the hips or neck cheating.
  • Hold the squeeze. Reach the top and freeze for a count instead of cycling reps. Same drive, less fatigue management.

Combat Sprawls

  • Step the feet. Step back and step in instead of jumping. Same shape, no impact.
  • Hands elevated. Hands on a bench or step so the floor never comes all the way up to you.
  • No jump at the top. Stand tall and reach instead of leaving the floor.

Fast Calf Raises

  • Step instead of jump. Same pattern, same range, no flight. Keeps the pace without the landing.
  • Lower and slower. Keep the jump but cut the height and take the landing softly.

Mistakes and who it is for

  • Opening the hollow hold at a sprint makes the hollow hold the piece that falls apart.
  • Cutting the hollow hold short to reach the back widow 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 Hollow Hold, Back Widow, Combat Sprawls, Fast Calf Raises.

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

Run it with friends

The Iron Yoke runs on a shared countdown: share a rally link, everyone gets the same 20-minute clock, and the leaderboard updates as people log rounds.

Start this workoutMore 20 minute AMRAPs