3. Medicine Ball Plank
This is a step up from a traditional plank. Placing your hands on the ball provides an unstable surface for your body. Rather than being steady on the floor, the obliques and surrounding core muscles have to work to keep you from wobbling back. If you already experience low back issues, start this move with knees on the ground and progress to a full plank, or eliminate the ball and just practice a traditional plank.
1) Begin kneeling on the floor with hands cupped around medicine ball.
2) Tighten abdominals and glutes and stretch your legs behind you to a straight line. Straighten arms but keep shoulders down away from ears.
3) Breathe and hold your body in a straight line. Avoid sagging through the low back.
Hold for 30 seconds. Rest. Repeat if desired.