TRX Jackknife
Feet in the straps, hands on the floor in a plank: draw the knees to the chest and push them back out without the hips rising.
How to do it
Setup
Feet in the straps, hands on the floor, plank line set.
Steps
- Draw the knees to the chest.
- Hips stay level – no piking.
- Extend back to the hollow plank.
Common mistakes
Swinging in the straps: pause at both ends. Hips lifting: that is the pike, another exercise. Shoulders drifting: stacked over the wrists.
Breathing
Exhale on the tuck, inhale extending.
