Just Need to Do ItI used to love to run. Sometimes I still go for a jog, although my doctors would have a fit if they found out.
I shattered my knees when i was 14 because I had a bone disease that was never diagnosed (despite 5 years of complaints)
I move all the time, I never sit down at work, in fact. I wore a pedometer to school and discovered that I walked 8 miles that day - just not all at once - it was a LONG walk from the car to my classroom, I walk the halls during the passing periods, moving the kids, running up and down the halls to make copies, clearning the halls on my conference periods, etc. But that is not real exercise.
We have an elliptical machine here at home, but I am so tired from being on my feet all day every day that I rarely use it. When I do, I love it, because it is low impact enough not to really hurt my knees anymore.
I wish I could lift weights and such, and I have a gym membership, I am just always so tired. The stupid part of that statement is that if I exercised more, I wouldn't be so tired all the time - in theory.