Cable standing crunch

Attach a cable handle to a high pulley and stand facing away from the machine. Hold the handle with both hands and place it behind your head, keeping your elbows bent. Stand with your feet shoulder-width apart and your knees slightly bent. Keeping your abs engaged, exhale and crunch your torso down towards your knees, bringing your elbows towards your thighs. Pause for a moment at the bottom of the movement, then slowly return to the starting position. Repeat for the desired number of repetitions.