Jackknife

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Jackknife strength exercise instruction with picture and video.

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Jackknife
Muscle: Abdominals
Other: None
Type: Compound

Lie flat on the floor with your hands above your head and your legs extended straight on the floor. Simultaneously bring your legs and arms together as you exhale. Do not bend the arms or the legs and keep your torso straight. Inhale as you slowly lower yourself to the starting position.
 

Start/Finish:                                          Mid-Rep:

 

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date: June 27, 2006