My workout doesn’t feel complete if it’s without a heart rate monitor. It’s like driving without a seatbelt. But even my trusty heart rate monitor is somewhat lacking in the data it provides. The Ki Fit, available in the U.K., is a device worn on your arm, and tracks all kinds of movement and body chemistry to give you more information than how hard your heart is pounding during a sprint.
The Ki Fit system tracks calorie burn; physical activity; steps taken; sleep duration and sleep efficiency. Through a subscription to Ki Fit Online Activity Manager, you can analyze the data along with a food log and other reporting. Certain functions such as the physical activity and calorie count are measured by an internal accelerometer. Another sensor can detect your hydration and sweat levels.