I did my 14 miler on Saturday and felt pretty great until the 12th mile, then I started to crash and it was really difficult to finish, but I did. It's the longest run I've completed ever, yay! I rested most of the day but I woke up yesterday with terrible back pain. I'm sore all over, upper and lower. I know that it running does put a lot of stress on your back, but geez, this is rough. Any tips to get the soreness out so I can get back to running tomorrow. Or any tips on prevention so this Saturday's 16 miler doesn't put me out of commision again?TIA!