> Not everyone is rich enough to have the time to exercise.

You don't have to be rich to find time to exercise. For example, I commute 20 minutes by bike to work. I could easily spend 10 minutes driving instead, but by cycling, I get at least 40 minutes of physical activity in every day.

If I wasn't as well off financially, then I would seriously consider selling my car and getting rid of the expenses associated with it and move to full time commuting by bike.