This is a little off topic, but is worth discussing here.
I've been bike commuting for well over a year now. I even sold my A4, so now I'm stuck. I found that my 30 Mile bike commute from work takes 1:20. The same trip in a car takes 50 minutes. I never took the time exercise when I drove. Now I get almost an 1.5 hrs of exercise in 20 minutes.
Last winter, the strength and conditioning that resulted from biking had a remarkable impact on the number of laps i could take in a day. Biking through the winter keeps me fit and flexible. There were only 4 days last winter that I couldn't ride because of snow even though it was a record year in SLC. I felt like I was a kid again. I used to go home after lunch, but now it's last chair!
I plan on doing squats and lunges as well twice a week.