Recommendations: 1-3 Sets, 30-60 Dur
Position yourself face down with your elbows and forearms on a fitness ball. Your legs should be straight behind you with the balls of your feet on the floor. Your back should be straight and you should look forward not down. This is the starting position. Contract your abdominal muscles tightly. Hold this position as long as you can. Keep looking forward and your back straight. Do one repetition of this exercise but try to extend the time you can hold the position each time you do it.