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This High-Volume Interval Training Workout Will Make You Sweaty For the Full 25 Minutes
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8

Hollow Rock Flutter Kick 

  • Extend your arms straight back behind you with your legs extended out.
  • Lift your upper back and head while hovering your legs off the floor, hollowing out your belly.
  • Make sure your lower back does not arch up.
  • Flutter kick your feet for a count of 30.
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