We got a cheap exercise bike ($200 or so) off eBay. We used it a bit when we first got it, then we didn't use it for a while... But in the past couple of months I've been very committed to losing weight and have been getting on our exercise bike almost every night after the kids go to bed. At first it was only 10 minutes, now I tend to do 30-40 minutes.

I think it's like anything - if you're motivated enough, you'll use it .