A tracker can measure steps, heart rate, sleep, and recovery, but more measurements do not automatically improve health.
Fitness trackers make it easy to collect numbers about the body. Steps, heart rate, sleep scores, and recovery estimates can all be useful, especially when they reveal a pattern over time. But a number can also invite attention simply because it is available.
The data is only helpful if it changes a decision in a sensible way. A score is an estimate, not a complete account of how someone feels or what they should do. It is possible to become more informed about measurements while becoming less clear about the basic question: am I making choices that support my health?