The modified Pilates roll-up with ball is a version of a crunch with straight legs. This exercise increases core strength and stability while also engaging the glutes and hamstrings.
Lie on the floor with a Pilates ball placed underneath your heels. Extend both arms over your head with your palms facing each other.
Keeping your legs straight and feet pressed into the ball, slowly roll your arms forward, lift your shoulders off the ground and reach for your feet. Inhale slightly and return to the starting position.
Avoid hyperextending your neck. Keep a natural head and neck position.
Avoid losing contact with the ball. Keep applying pressure on the ball with your heels.