Remy has unfortunately just been diagnosed with a grade II knee sprain after falling during a run. He will be required to attend physical therapy and will not be allowed to return to his track team for five weeks until he is completely healed. To prevent an injury like this in the future, Remy should do all of the following EXCEPT

A. avoid runs if he is still in pain or too tired

B. make sure his shoes are slightly large so he can grow into them

C. run on the flat, even surface of the track at his school

D. stretch and warm up before going on any runs or other physical activity