I've run over two dozen marathons including Boston five times, several 50Ks and 100Ks, two 100 milers and both 12 and 24 hour events. I never felt pain in my ch

I've run over two dozen marathons including Boston five times, several 50Ks and 100Ks, two 100 milers and both 12 and 24 hour events. I never felt pain in my chest. These long events leave me feeling weary and fatigued, and sore in places no doubt, but never what I'd call in pain, and definitely not in my chest. If I ever felt pain in my chest I'd definitely get that checked out.