This silly little thing is the pedometer I've been carrying in my pockets for years now. It's part of a program through my company where you can earn rewards for certain milestones. It gives me a idea of how many steps I take in a given day. There's a iPhone app that goes with it too and I upload my steps each night.
As of this morning I've walked (at least) 7000 steps each day for 104 straight days in a row! All of them include at 2+ mile walk each of the 104 days, and in many cases, e.g. weekends, so many more steps from working in the yard.
It's made a noticeable difference to me - I've dropped some weight. I feel better and I have more stamina.