Do spend some time with the stickied threads...
but short answer.. anything that gets you moving and you will do consistently is a good way to exercise... Walking is free... Dancing to music is pretty much free...
The downside to biking if you haven't biked in a while -is your butt can get pretty sore...
Im thinking about buying a bike, is it a good way to exercise??
You can use biking for exercise and you can use it for transportation. I ride a bike to work and that way I get to exercise at least twice a day, on the way to work and home. That is providing you don't work a huge distance from your home.
Im thinking about buying a bike, is it a good way to exercise??

The downside to biking if you haven't biked in a while -is your butt can get pretty sore...

Could have been me. And yeah the bike seat should be as wide as your 'sit' bones, not your ass.Somewhere (my memory is failing me - I think it was wishes) who gave a pretty good explantion of what type of bike seat you should look for - I don't recall it being the softness of the seat or the size of the seat either-but how the saddle fits you...