Sit on the lever crunch machine with your back supported and your chest positioned against the padded lever. Secure your feet under the foot pads and grip the handles if available. Start in an upright position, then engage your core and curl your torso downward by bringing your ribs toward your hips. Exhale as you crunch and squeeze your abs at the bottom. Slowly return to the starting position in a controlled motion without letting the weight drop. Keep your hips stable and avoid using momentum.
Log your lever seated crunch sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.