The prisoner half situp is an abdominal exercise performed with body weight, focusing on the abs and hip flexors. It involves lying on your back, hands behind your head, and curling your torso up to a 45 degree angle before lowering back down.
Also Works
Hip Flexors
How to Perform
1
Lie flat on your back with your knees bent and feet flat on the ground.
2
Place your hands behind your head with your elbows pointing outwards.
3
Engaging your abs, slowly lift your upper body off the ground, curling forward until your torso is at a 45 degree angle.
4
Pause for a moment at the top, then slowly lower your upper body back down to the starting position.