Give this core movement a shot. All you'll need is something heavy to hold on to.

Tips

  • When extending the leg, make sure you're exhaling and keeping your core engaged.
  • There should be no space under your lower back; keep it in contact with the ground.
  • Keep a neutral posture and don't overextend.

Related:  Big, Thick, Chunky Ab Training

Related:  The 5 Best Ab Exercises for Athletes