Gone are the days of back-straining sit-ups. In their place is the Crunch--an exercise that precisely isolates different abdominal muscles. Top fitness trainer Karen Amen demonstrates how doing just a few minutes of crunches a day can strengthen your back, improve your posture, and give you a flatter stomach in just one month. Includes step-by-step photos.
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Gone are the days of back-straining sit-ups. In their place is the Crunch--an exercise that precisely isolates different abdominal muscles. Top fitness trainer Karen Amen demonstrates how doing just a few minutes of crunches a day can strengthen your back, improve your posture, and give you a flatter stomach in just one month. Includes step-by-step photos.
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