Hip Dips
1) Begin in a forearm plank position with your forearms flat on the mat, making sure that your elbows are aligned directly under your shoulders, your core is engaged, and your body is in a straight line from your head to your feet.
2) Lower your left hip toward the floor until it almost touches and then immediately raise back to center.
3) Repeat on the right side.
Targets: shoulders, core, back