http://www.thefactsaboutfitness.com/ With a Swiss Ball, loaded barbell or a Power Wheel in front of you, kneel down on the floor. Take your knees off the floor and straighten your legs. In this position, only your toes should be in contact with the floor. Push the ball forwards as far as possible, pause for a second, and then return to the start position.
It's important to "brace" the abdominals (rather than pulling them in) during the more challenging parts of the exercise. This involves tightening the abdominal muscles as if you're about to take a punch in the gut. Avoid arching or rounding your back — focus on keeping your spine in a "neutral" position
You might also find that you want to hold your breath briefly, particularly at the end position of the rollout. Although this is often frowned upon by many exercise professionals, holding your breath actually raises intra-abdominal pressure, which increases the stability of your torso.
This elevated intra-abdominal pressure, when combined with abdominal bracing, provides support and strength to your torso by making it stiffer.
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