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