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This 10-Minute HIIT Ab Workout Is Cardio and Core in One
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Seated Knee Tuck

  • Start sitting on the floor with your hands about an inch behind your back with your fingers facing forward, your knees bent, and your feet on the floor in front of you. Lean back slightly to hover your feet off the floor; this is your starting position.
  • Lift both feet up off of the ground and extend both legs to hover off the floor as you simultaneously lower your upper body backward a few inches.
  • With control, bring your legs back to your chest (without touching the ground) and lift your chest to return to the starting position.
  • Continue for 30 seconds. Rest for 10 seconds.
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