Make an exercise bike out of a regular bike
I remember seeing some kind of attachment that you could use to transform your bicycle into a stationery bike for exercise, but that was a long time ago and I can't find it. Can someone come up with a gadget to do that. I don't need the attachment which tells you how many miles or how fast you're peddling. I would just like to watch TV or read while exercising and I can't walk for any length of time without my back hurting so I also can't go anywhere on the bike.