How does it damage knees? Body mechanics and amount of activity determine that, nothing to do with what you're running on.
Think you'll find, l, in any sports literature about meniscus injuries from running, it's always recommended to avoid pavement -- far too unforgiving 'n stressful on the knees.
lol @ 8 miles for a 12 round fight. everyone is different. i've seen cross country runners gas out while playing badminton in high school.
Dont know too much about surfaces,i always use a tread mill.But i would have thought they would use an athletics track.
I see you always typing the first letter of the person you're responding to and I'm curious, what would you type if you were responding to me? :think