My Son Just Finished Up An Hour Long Basketball Practice

My son just finished up an hour long basketball practice with wall swuats/push ups/drills......He said his quad was hurtinghim really bad - making his stomach hurt......I told him he probably didn't stretch enough before practice and pulled a muscle.....He got out of the shower and noticed a tiny bulge where his leg bends at the hip....It is only on one side and hurts really bad when he touches it......