Your fitness tracker is (probably) lying to you
Don’t rely on a wrist computer to tell you how healthy you are, no matter how much it costs.
We live in a golden age of health tracking. There are apps to track your steps, to input food and drink intake, plan your rise to become fully active from that spot on the couch, and lots more. If you’re really serious about it, you can buy an accessory for your phone that helps track a whole bunch of different fitness activities. The inexpensive models can count your steps and tell you how far you’ve gone, the mid-range models will help you with segment break downs as you run or mile counters as you ride your bike, and the most expensive models are fully waterproof and will track your swimming and all sorts of other things.