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.
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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