One of my motivators to keep active is my Fitbit Flex
. It doesn't automatically buzz if you're not being active like some bands, but you can set alarms throughout the day to remind you to get up out of your office chair or whatever. Sure it's not super accurate, and it won't make you melt the pounds away magically. But it will keep you moving if you're the video game achievement or statistics type person like I am. GET ONE.
One caveat, the bands near the lcd window are super fragile and commonly break where you put the tracker module into the band. I've already broke one and it's only been a month!