Hang from a chin-up bar with both arms extended at either a wide grip or a medium grip. Alternatively, you can attach ab slings to bar. If needed, use calf block to get into position. The legs should be straight down with the pelvis rolled slightly backwards. With knees bent, raise your legs until the torso makes a 90-degree angle with the legs. Slowly return to starting position. Repeat this movement for all reps then dismount from bar.