jackknife sit-up

Equipment

body weight

Target muscle

abs

How to perform

1. 1

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

2. 2

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

3. 3

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

4. 4

   Repeat for the desired number of repetitions.