The Best Abs Exercises You've Never Seen Before 13 top trainers share their most creative, crazy-effective core moves By Jessica Smith
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PLANK TO STAND UP This tough move can help improve flexibility in your hamstrings and hips while also toning your core, legs, and back. Quick Form Tip: If it's too difficult to stand up with your hands on the ground, place your hands on top of your front thigh for more support. Do the same on the way back down.