Treadmill and Reading

I went to the gym solo today, since Melissa was busy. I fell into my old habit of reading on the treadmill. I'm still not back to my normal pace. Today I walked about 3.25 miles and rode the bike about the same - at least it was better than nothing. When Melissa joins me I push myself harder because I need extra motivation to get on the elliptical machine which she loves. I don't like it because its harder work than the treadmill, but my doctor and a physical therapists have told me that I shouldn't run on a treadmill and that the elliptical would be best for me.