On your side position your elbow under your shoulder.
Straighten your body and hold.
Hold for the desired amount of time.
Positioning elbow too far up.
Hips caving down.
Torso not being straight.
Lie down on a flat on ground with your elbows flared out at 45 degrees.
Extend your elbows out until they're almost straightened.
Bend your elbows back down to the floor and repeat.
Hips coming off the ground.
Elbows flared at 90 degrees.
Wrists out of line with forearms.