How to do the Jack Split Crunch
- 1Lie flat on your back with your arms extended overhead and legs straight.
- 2Simultaneously lift your arms and legs off the ground, bringing them together above your torso.
- 3Split your legs apart while keeping them straight as you reach towards your feet with your hands.
- 4Return to the starting position with control.
Muscle group
Core
Type
Reps Only
Equipment
None needed
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