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In a plank position, place your feet together, toes on the floor, with your hands together atop a medicine ball (you can form a diamond with your index fingers and thumbs on the ball if you wish) and your elbows extended. Keeping your head neutral and abs tight, lower yourself as far as you can by bending your elbows, then press through your palms until your arms are straight once again, focusing on flexing your pectorals and triceps while also maintaining your balance throughout.