One of your athletes went to the emergency department to get checked for a concussion after yesterday's practice. when he arrives at practice today, what would you do?

I believe the answer is Tell him you need a note from his health care provider to see if he can participate in practice.

A concussion can be dangerous and need an immediate medical assessment. Doing exercise will be dangerous as it could increase the risk of an accident. It is important to make sure that the athlete is already assessed to prevent an unwanted accident.