When you're trying to convince your significant other to either 1) Let you spend the money to go get a massage or 2) give you a massage, here is the rationale. http://www.sciencedaily.com/releases/2008/08/080812213937.htm Hard days hard, easy days easy.

This is pretty interesting... “Before the race, the dogs’ metabolic makeup is similar to humans. Then suddenly they throw a switch — we don’t know what it is yet — that reverses all of that. In a 24-hour period, they go back to the same type of metabolic baseline you see in resting subjects. But it’s while they are running 100 miles a day.”