Unbreakable is a core circuit that spends most of its runtime in a plank and all of its runtime testing whether you can hold one. Squats and knee strikes open the set standing, then the floor takes over: push-ups, up and down planks, elbow plank rotations, body saw and plank rolls. Five of the seven exercises are plank variations, each one attacking the position from a different direction. The name is the job description - the workout tries to bend, twist, slide and fold you, and your trunk's task is to refuse.
The rep counts split into two currencies. The 10-count exercises - squats, knee strikes, elbow plank rotations, plank rolls - are the movement work, building rhythm and cumulative fatigue. The 4-count exercises - push-ups, up and down planks, body saw - are the expensive ones, full-body transitions where every rep travels through the shoulders and core slowly and completely, and four honest reps cost more than ten quick ones. The sequencing escalates the challenge to the plank itself: push-ups load it vertically, up and down planks change its height one arm at a time, rotations and rolls twist it, and the body saw shears it lengthwise. Same position throughout, different attempt to break it every time.
Squat with heels down and drive up through your whole foot. Bring each knee strike up sharply to hip height while your hands stay guarding - the standing pair is also your heart rate engine, so keep it moving. In every plank variation the rule is identical: hips level with your shoulders, glutes on, no sag and no pike. Move through the up and down planks one arm at a time without letting your hips seesaw, rotate and roll from the shoulders and hips as one unit, and in the body saw, shift forward and back over your elbows in small, controlled strokes - the smaller and slower the saw, the harder the core works.
Everything in this circuit is designed to find the crack in your plank - finish all your sets and there is not one to find.
Make it Harder: Take the three 4-count exercises to 6 reps at the same slow speed.
Make it Easier: Perform the push-ups and up and down planks from your knees.
