Murray seems to have a tennis specific body type, something he's worked on since the beginning.
Carrying those big calves, like DJ might not be the best for long distance running.
Can Kohlshreiber beat Murray in a distance running race? I'd think so.
Ferrer is really fast on court, but maybe not for longer distances.
Seems a dearth of long lean, runner builds in tennis....maybe because they don't change directions all that well.