Dis he get the clot shot?
I would think 18 years old is not a good age to participate in 13 mile runs, or marathons either. There are better ways of proving stamina, like running a 5k, or cross country. Running until the heart breaks, is stupid. Marathons and half marathons should require a monitor for the runners until they have participated at least twice. I had a friend died at the age of 19 doing the same thing. He was a lifelong runner, and he blew out his heart just like this kid did.