Lower ab crunch
Place stability ball between your feet (pressing it in place with your ankles).
Lay down, keeping back as flat as possible.
Make Your tummy is sucked in.
Keep legs straight (it’s ok it they bend a little) and slowly raise your legs off the ground, keeping the ball stationed between your legs.
Pull your legs as close to your torso as possible (you want to make sure you are still lying flat and your core is engaged).
Hold position for a count of ten, then slowly release your legs to the starting position.
As seen in the photo, you can making this move more difficult by adding a crunch or “pulse” while the ball is in the air.