Simple past tense and past participle of overtrain.(verb)
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Use "overtrained" in a sentence
"Sometimes they become overtrained, which is the worst thing could happen to them."
"Cushing claims he has a unique medical condition stemming from something called overtrained athlete syndrome."
"HOUSTON - The Houston Texans asked the NFL to reduce or rescind the four-game suspension given to star linebacker Brian Cushing on Monday, saying he has a unique medical condition stemming from something called overtrained athlete syndrome."