Your definition comes close, Rino, but neither - especially your teacher's - is totally correct. A "weekend athlete" is a person that exercises only at the weekend and can hardly be called an "athlete". Chances that such a person will injure himself or herself, especially if they are not careful and moderate in their approach to exercise, are greatly increased.
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Rino... my English teacher says that he meant he moved his strained muscle to check how bad it was after playing tennis.No! That would be something like: