For most of us, working out in and of itself isn't always the most fun. If you're in that boat, mutli-tasking with your workout can make all the difference.
That's what Instructables user dedlast was thinking when he put together his guide for mounting a hands-free book holder to his (stationary) exercise bike. You'll need a bit of hardware to get the job done, but none of it is terribly expensive. Obviously there's nothing groundbreaking about this idea, either, but it did get us thinking: Multi-tasking and exercise go hand-in-hand for so many people that we'd love to know what sort of things you tackle while you're exercising.
The flip side: There is something to be said for exercising for exercising's sake—in which you don't do anything while you're working out but focus on your workout. Whichever route you take, let's hear more about it in the comments.