The correct sentence is:
Coach Taylor told the players that they should get a lot of sleep, eat a good breakfast, arrive early, and do warm-up exercises before the game.
Parallelism is a writing resource that lists a set of items or actions using the same grammar structure and pattern. In this case, the mistake found in the original sentence was the phrase “To do warm-up exercises before the game.”
In order to maintain the pattern of the sentence, the infinitive “to do” was changed to the bare verb “do”. The pattern of the corrected sentence is “should+bare verb+ object” as in “get a lot of sleep”, “eat a good breakfast”, “arrive early” and “do warm up activities.”