2. Side Crunch On Swiss Ball

Instructions: Firmly place your right hip on a Swiss ball. Lean into the ball but ensure your torso is off it. Support yourself by pressing the soles of your feet against the bottom of a wall. Place your hands by your ears and contract your left oblique muscles, lifting your torso up as far as you can. Hold for three seconds and release. Do 10 reps and repeat on the opposite side.