src: assets.menshealth.co.uk
A jackknife is an abdominal exercise. Jackknife exercises are designed to work the abdominal muscles, particularly the lower abs. There are a number of variations of jackknife exercises that allow people of different ages and ability to work their abdominal muscles. The jackknife can be done on an exercise ball, exercise bench, the floor or on an exercise mat.
Video Jackknife (exercise)
Instructions
- Preparation.- Sit on floor or mat. Lie supine with hands to sides.
- Execution.- Simultaneously raise knees and torso until hips and knees are flexed. Return to starting position with waist, hips and knees extended. Repeat.
Maps Jackknife (exercise)
References
src: www.billpearl.com
See also
- Wii Fit
Source of article : Wikipedia
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