Use a stability or exercise ball for your abs crunch. Lie down with back pressed firmly on the floor. Secure the stability ball between your feet. Hold a medicine ball in your hands.
Then lift your legs up while you crunch up with the medicine ball. Meet and touch both balls at the top. Lower yourself down again and redo steps.
There are many videos and abs exercises one can get from trainwithmeonline.
This is a very popular abs crunch exercise. If you are a beginner make sure you have someone to assist you at first and hold the ball while you do trim your abs. Lay on top of the stability ball in a supine position. Bend your knees while your feet are place firmly on the floor. You may fold your arms across your chest. You may put them behind your head also. Decide which position you can maintain the most balance. Flex your midsection by raising shoulder blade off the exercise ball. Then slowly lower yourself to relax stretch position. This will squeeze your abs when you are at the top of the motion.
