Adidas miCoach Smart Run

An impressive motivator, the miCoach has tap-and-swipe navigation, a built-in Bluetooth MP3 player, and a strapless optical heart-rate monitor, and plays running and cross-training workout videos/tips (downloadable via WiFi). The miCoach is a more-than-capable on-wrist trainer; our only complaint is that its battery lasted only four hours when all of its features were working hard. [$400;]