You're going to have to be more specific. Depending on the severity, you could be med down, and continue with your class, or you'll roll into GTX until you get healthy, or if it's minor, you can tough it out. My best advice is to show up in good enough shape that you can get excellent low by the mid PRT (6th week), that way, if you sprain an ankle or something stupid like that and can't run the out PRT, they can sub your mid-PRT for it, and you won't roll.