Personal trainer that goes on your wrist

The Fitbit Force went on sale in October, costs $130 and comes in black and navy blue. Its matte finish makes it less conspicuous than other wristbands.
Fitness trackers have been out for a while. The first ones were pretty clunky and only good at measuring the amount of steps you were taking. Today it’s a different story.
Jenna Wortham writing in The New York Times, gives us a rundown of some of the best ones on the market.
There’s the Jawbone UP24, a discreet, textured rubber bracelet that uses Bluetooth to transmit sleep and activity information to a smartphone app that its wearer can check throughout the day. Then there’s the newest version of the Nike Fuel Band, the SE, which has been configured to nudge its wearer at intervals throughout the day to remind them to stay active. Even companies like LG and navigation makers like Garmin are bringing out versions of fitness trackers designed to be worn on the wrist.
You can also choose the Fitbit Force, a standout according to Wortham.
The Force went on sale in October, costs $130 and comes in black and navy blue. It is a thick rubber band with a simple and small OLED screen. Wortham has used older versions of the Fuel Band and Jawbone UP24, and she prefers the Fitbit Force to both.
It’s the lowest maintenance of the three. The band needs to be charged only once a week, if not less, through a USB cable that plugs into a computer.