How to make sure your fitness trackers are secure

It’s safe to say that few technologies have changed personal fitness more than wearable fitness trackers. These devices collect data to provide in-depth tracking of many different exercise parameters for coaching, analysis, record-keeping, and other purposes. But with all that data, how can you be sure your privacy won’t go flying out the window?
What data is being collected?
The first key to securing data from a tracking device is understanding precisely what is in that data. The ca