Do it: Lay face up on the floor with arms straight above your shoulders. To start, bring your knees directly over your hips and bend at the knee so that your calf forms a 90-degree angle with your thigh. Next, simultaneously lower your left arm above your head while straightening your right leg and sending it towards the floor. Pause, return to the starting position, and then repeat on the opposite side. Do 14 alternating reps to complete one set.
Lie on your back and bend your knees, placing a Swiss ball across your hips. With your hands on top of the ball and your body crunched forward as demonstrated, push your arms down as hard as possible for six seconds. The harder you push, the more the ball will resist you, giving your abs an intense stimulus. Exhale, relax for a few seconds, and then repeat.
To do it: Stand with your feet hip-width apart. Bend your knees slightly (or more if needed) and place both hands flat on the ground. Keeping your legs extended and your feet planted, walk your hands away from your body, as far past your shoulders as you can, until you are in a full plank position. Hold for one count at the furthest point, and then walk your hands back to your feet and slowly return to standing. That’s one rep. Repeat up to 10 times.