People really do need to adjust lifestyles. Do we need to get in the car to drive three blocks to post office or video store. I started riding my bicycle and enjoy it immensely. But the area I live in isn't too hilly.
Would you mind running to the store for me?
A brilliant guy in my school lost his college professor father to a bicycle accident. It is great in theory, but I just don't like the odds of survival.
Plus, many bicyclists seem to think they are above the normal traffic laws. They go straight through stoplights as if they only applied to cars. Many motorcyclists think that if they can fit between two cars, they have the right to squeeze through and pass them on the interstate that way.
I liked riding a bike in China back when most of the traffic was bikes. Very pleasant. But riding a bike in the US is for people who want to die healthy and young.