A young man sets a goal to compete in a marathon in two weeks. He started training last week by exercising three to four times a week with his friend. After each training session he writes his daily experiences to assess problems that may hinder his achievements. What aspect of his fitness program could keep him from achieving his goal? A. The use of a friend as a support system will decrease the likelihood of John achieving his goal. B. Assessing training obstacles once a week is not frequent enough to solve problems that arise. C. Training three to four times a week is too intense and may cause injury. D. The original goal that John set does not leave him enough time to train.