Ridgeline Fitness Podcast 9 "The Knee Tuck"

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The Knee Tuck or Jackknife is a challenging exercise that works your body from head to toe. The exercise i...
The Knee Tuck or Jackknife is a challenging exercise that works your body from head to toe. The exercise is somewhat similar to Rollouts, requiring your lower abdominals to contract isometrically, stabilizing your spine.
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