Originally Posted by Gallium
It isn't? If you don't have legs, I would have to agree, but if you have legs, and can walk, one of the metrics for fitness is your resting heart rate, and your ability to get to 85% over that rate, and your O2 perfusion.
What you got that is going to do that apart from moving your limbs faster than you normally do to increase your respiratory rate, stroke volume and heart rate (and no, sex aint it....
Doc says I'm done running unless I want to get replacement knees, so I thought about it and I'm done running.
Aquajogging, stair master, climber, cycling, elliptical, rowing, there are any number of things that will suffice that do not put the pounding of running on your joints.