Fitness Tracker Reviews 2025. A fitness tracker is essentially a bracelet with sensors that send data to your phone to provide an expanded picture of the data it collects, and usually requires a. Engadget tested some of the cheapest fitness trackers you can buy, all coming in at under $100.

The best fitness trackers for comprehensive fitness tracking we tested are the fitbit charge 4 and the garmin vivosmart 4. Fitness wearables can help you move more, sleep better, and stay healthy.