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Summary: Use a stability ball to tighten abdominal muscles during the bridge exercise. Learn the bridge with tips from a professional trainer in this free exercise video.
"This next functional core exercise is the bridge, and this is a really great exercise to work those glutes, the abdominals, your lower back -so your entire core. We're really going to get strong in this area. So just come down on top of your ball. Walk your feet out until you come all the way to your head and shoulders. Now here you should be pretty relaxed here in your neck and in your shoulders, and you can just place your hands right at your hips. Inhale to prepare, and exhale. Lift your hips up as high as you can, squeezing those glutes, and then lower down, and lift up and squeeze, and lower down, lift up and squeeze. As you're performing this exercise make sure that your feet are hip-width apart, and you're thinking about tightening up your abdominal muscles, tightening up your glutes, your lower back is really working. These muscles are really good to help stabilize your internal organs, your spine, so we're really going to help improve that posture. Continue to perform this exercise until you fatigue your muscles. To get out of this position simply just lower your hips down, and gently walk right back up again to a seated position. That is your bridge."
eHow Article: Stability Ball Bridge Exercise