Chair Seated Diagonal Crunch

Sit upright on a sturdy chair with your feet flat on the floor and place your hands lightly behind your head with elbows wide.

Engage your core and slowly crunch your upper body forward and to one side, bringing your shoulder toward the opposite hip.

Pause briefly at the bottom of the movement while squeezing your oblique muscles.

Return in a controlled manner to the starting upright position.

Complete all repetitions on one side before switching to the other side.