It is a total leg amputator.
The 800 m is somewhat of a killer also.
The marathon is just plain stupid if you get a sprint at the finish.
Ahhh its just plain stupid anyway.

The day a man wins the 400m and the 800 m will be the day you see the greatest athlete ever. The diff. in the body conformation for these two races is amazing.

100 m 200 m, real muscular guys... 400 m they slim down a bit(except Michael Johnson), 800 m and they turn to greyhounds. After that, 5' 6" 125 lbs is about the right size.