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Add This Simple Piece of Exercise Equipment to Your Planks to Sculpt a Strong Core
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Oblique Tuck-Ins With Sliders

  • Start in a plank position with your hands directly under your shoulders and sliders under the balls of your feet. Your right ankle should be crossing over your left.
  • Keeping your core engaged, tuck your knees toward your left elbow, and back out behind you for one crunch.
  • Complete a total of eight to 12 reps, and repeat on the other side.
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