I hate running. It makes my lungs hurt. It makes my head hurt. It's just horrible all around. But i'm shockingly a decently speedy sprinter (as compared to other non-athletes such as myself). I guess my knees are just more symmetrical than fnord12's.

In the new work, published November 17 in PLoS ONE, Rutgers University evolutionary biologist Robert Trivers and his colleagues measured the knees, ankles and feet of 73 elite Jamaican track and field athletes, including Olympic runners and one world champion. The researchers also examined the same body areas of 116 nonathlete Jamaicans of comparable age, sex and weight.

The comparison revealed that the sprinters' knees and ankles were significantly more symmetrical than those joints in the control group. Within the elite sprinter group the knees and ankles of the 100-meter sprinters were the most symmetrical of all; symmetry in the longer-distance sprinters (200, 400 and 800 meters) was less marked but still linked to the best race times.

Course, after about 200 meters, i'm about ready to lay down and die, so the victory is a little tainted.