Then, I would ask the following questions : do you tend to get injured often, and if so, what kind of injuries ? How could we work to prevent those (in the case of those injuries being induced by carelessness or inappropriate warm-up) ? But, most importantly, do you enjoy playing ? What is your favorite part of a game ? How is your relationship with your team ? Both physical and mental health should be mentioned in this type of check-up.
First, I would advice the player to make sure he stretches correctly before practice and that he stays hydrated enough both before, during and after the practice to prevent injuries and dizziness. Another advice to practice safely, in the context of a contact sport such as football for example, would be to wear appropriate protective equipment (especially regarding the joints) and to always make sure your neck and head are protected (with equipments or arms) as to not risk any concussion or life-altering injuries (regarding the neck and spine).
Your answer is clear, well-structured, and shows a good understanding of both physical and mental health aspects of sports participation.