I wore out a couple of manual treadmills over the years, went to an elliptical and eventually wore that out, and decided to wear feet out instead.

The first thing I noticed was ankle fatigue. I guess the elliptical wasn't working my feet properly. That fixed itself in a few weeks.

Now it's been 2 or 3 years, and I wore out a pair or two of tennis shoes, but replacing the shoes is a lot cheaper than replacing a machine.

4 miles takes me about one hour and fifteen minutes. That's my normal walk.

Bob-a-rama