Antony's physical reasons to rest include headaches caused by a possible concussion; on the other hand, there can be emotional reasons such as fear to fail again.
Based on the text, Anthony is a successful young football player who has been trained by his father to be a running back. In the last game of the season, Anthony tries to cross the defensive line but he is hit by one lineman. This causes him not to continue playing as he expresses he has a headache.
The only symptom Antony has is headaches, which are the most common symptom when a concussion occurs. A concussion is caused by a sudden blow on the head, which was likely to happen as the lineman hit Antony.
Besides a concussion, there can be emotional reasons that make Antony not want to continue playing, the most likely reasons are:
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