This concept has been mentioned before. If I want to get to work as fast as possible, I drive, on the freeway, 7+ miles, and it takes 15 minutes. If I bike, under the absolute best conditions, a 6.3-mile route, I could do it in 30 minutes, but usually it is 35-40.

BUT, if I want to get the recommended 60 minutes of exercise every day, I can spend 30 minutes driving to and from work and 60 minutes jogging for a total of 90 minutes, or I can just ride my bike to and from work for a total of 60-80 minutes.

I really don't have time to drive to work.