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Exercises
Abs

Alternating Jackknife

Intermediate
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muscles worked
primary
Abs
How to do it
Execution:
  1. 1
    Lie down fully extended, arms overhead.
  2. 2
    Lift your torso and bring your right hand to your left foot (leg raised).
  3. 3
    Lower under control and switch, bringing left hand to right foot.
Tip: alternate sides without pausing to keep constant tension on the abs.