jackknife sit-up

How to perform it

Lie flat on your back with your legs extended and your arms overhead. Engage your core and lift your legs and upper body simultaneously, reaching your hands towards your toes. Pause for a moment at the top, then slowly lower your legs and upper body back down to the starting position. Repeat for the desired number of repetitions.

1. 1Lie flat on your back with your legs extended and your arms overhead.
2. 2Engage your core and lift your legs and upper body simultaneously, reaching your hands towards your toes.
3. 3Pause for a moment at the top, then slowly lower your legs and upper body back down to the starting position.
4. 4Repeat for the desired number of repetitions.