Originally Posted by dyna
They're essentially the same.
Also Wladimir does swimming now and he doesn't seem to gas anymore. (A 245 pound man can't run without hurting his knees anyway)
A treadmill is probably better for your knees too.(Because of shork absorbment)
Though running on a treadmill is easier than normal running (less air friction) so you either have to run at a higher pace or longer.
Treadmills with even more shock absorbment are even better for your knees.
running on a treadmill just bores me to death though...