Which of the following is a example of moving properly for push up? A-raising and lowering the body to a 90° angle at the elbow with a flatback. .B-raising and lowering the body to greater than a 90° angle at the elbow with a flatback. C-raising and lowering the body to less then a 90° angle at the elbow with a flat back D-raising and lowering the body with elbows locked out in a position in the flatback