First, the Smart Activity Tracker is compatible with both iOS and Android using the Fitness Band app to track, monitor and share your fitness habits (no big surprise given LG's handsets run Google's OS).

ENGADGET: LG's Smart Activity Tracker wields a swipeable touchscreen and smart TV apps, we go hands-on (video)

Fitness trackers like the Nike Fuel Band and the Fitbit are already hugely popular.

CNN: 'Smart fork' may help you lose weight

If you've been monitoring the fitness-tracking space, but have been holding out for a band that offers just a little extra, then it's worth considering the Flex.

ENGADGET

Fitbit's been in the fitness-tracking game for a while now, but today marks its first official entry into the wearable band space.

ENGADGET