Originally Posted by
mike868y
collarbone injuries are very common in motocross.
And what makes cycling an "impact sport"
I'd say it's not meant to be an Impact / contact sport. Correct. It becomes that. Like basketball. Not a contact sport, but they contact one another all of the time.
Originally Posted by
Tulex
I think it's the combo of high speed and low upper body muscle.
This sounds right.