I don't run. The bone deformities I have mean I never learned how as a little kid. And the structure is bad enough that learning to do it properly is likely to lead to injury. Even with orthotics, it's very painful for me to run. A 12 minute mile "running" is fast for me. That's how fast I can walk a mile.

I quite happily swim and walk. I keep wanting to get a jump rope for more impact exercise... that doesn't *hurt* the way running does. I want my bones to stay strong.