It is pretty common under situation of physical effort not to feel pain, which makes some sort of evolutionary sense. Another anecdote: during last year's Tour

It is pretty common under situation of physical effort not to feel pain, which makes some sort of evolutionary sense. Another anecdote: during last year's Tour de France, halfway climbing the Alpe d'Huez (~13.8km at avg 8% slope, nothing to scoff at), Vincenzo Nibali got knocked off his bike because it got hooked on a supporter's camera strap. He got back on his bike and completed the rest of the climb faster than the top contenders in front of him. When the doctors checked him, it turned out he had a fractured vertebra. I suppose that must've hurt.