jackknife sit-up

Instructions

1. 1

   Étape 1: Lie flat on your back with your legs extended and your arms overhead.

2. 2

   Étape 2: Engage your core and lift your legs and upper body simultaneously, reaching your hands towards your toes.

3. 3

   Étape 3: Pause for a moment at the top, then slowly lower your legs and upper body back down to the starting position.

4. 4

   Étape 4: Repeat for the desired number of repetitions.