Which statement best describes the benefits of muscular fitness training? a. high levels of muscular fitness can improve your self-image and improve or prevent chronic diseases such as diabetes, osteoporosis, and cardiovascular disease. b. low levels of muscular fitness also translate into low levels of back pain, injury, and chronic diseases like headaches and osteoporosis. c. low levels of muscular fitness will decrease your chances for sarcopenia and increase your chances of some chronic illnesses. d. high levels of muscular fitness translate into high levels of diabetes, osteoporosis, and chronic injuries that cause back pain.