4. CROSS CRUNCH
Lie on your back with arms and legs diagonally out so that your body forms an "X." Keeping arms and legs straight, bring your right hand towards your left foot, then your left hand towards your right foot, lifting your head, neck, and shoulders off the ground. That’s one rep. Aim for one complete set of 10 reps.
Holland says: “It’s a simple exercise, and you’re safe and supported on the ground. With the legs coming off the floor, you’re getting your lower abs. And because you’re coming at an angle, you’re hitting your obliques and your rectus abdominis, too.”