"Perfect Form: Swiss-Ball Crunch"

Because of its ability to target the entire core, the Swiss-ball crunch should be a staple in your workout. The exercise primarily works the rectus abdominis, or six-pack muscles, and the transverse abdominis. But when performed properly, it also calls on muscles that stabilize the hips and lower back.

Problem is, many men position themselves incorrectly on the ball and don't fully engage the transverse abdominis, which is a band of muscle that pulls the abdominal wall inward to protect you and helps activate other muscles.

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Courtesy of : http://www.menshealth.com/