If you want to do a lot of hacking, I was just looking at the Hexiwear: http://www.hexiwear.com http://www.hexiwear.com It's an ARM dev board with screen in a

If you want to do a lot of hacking, I was just looking at the Hexiwear: http://www.hexiwear.com http://www.hexiwear.com It's an ARM dev board with screen in a watch-like form factor. It has all the hardware you're looking for except GPS, but they sell a lot of add-on modules. I say "a lot of hacking" because I imagine you'd have to write all the fitness tracking software yourself, unless you find something similar on https://www.hackster.io/contests/Hexiwear https://www.hackster.io/contests/Hexiwear