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Anonymous
don' t do Sit Ups (especially on a ball)
the architecture of the big abdominal muscles dictate that it is not meant for big movements as in a full sit-up on the ball. Further, sit-ups promote an often undesirable flexion of the back (rounding). In fact the National Institute for Occupational Safety and Health (NIOSH) recommends a limit of 3400 newtons of force to keep the back safe. Sit-ups contribute 3413 newtons. Better alternative: Short range crunch, tabletops, prayers.
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