Even Chip Kelly agrees that when it comes to football injuries, the leading sports science will always be physics, as in the physics of what happens when strong, fast men collide with great force.
"If someone breaks a leg, someone breaks a leg," Kelly says.
It didn't matter when Nick Foles was driven into the ground last season that he had gulped every health smoothie put in front of him, that he stuck rigidly to the diet regimen outlined for him, or that he slept right, hydrated properly, and stretched religiously. The aptly named Houston linebacker Winston Mercilus brought his 258 pounds down on Foles and the quarterback's collarbone broke.