I think Greg needs to start small than go bigger on the excersise .
He shouldn't rush on the process and he should be careful.Take everything slow.
He should work hard but not to the point where he gets hurt again or more.
Remind him to stretch before he does
Excersising.
He should run shorter distances and than later increase the number of miles or laps he is running .
I hope I helped I am not really a athletic person though
<span>Accidental injury means an injury that results accidentally or from any external, violent and anticipated causes. For instance, an unintentional bodily injury resulting from any external force and against the normal course of events can be categorized as an <span>accidental injury</span></span>
If i’m not mistaken i think your answer is “A”.
i hope i could help! good luck :)