I have two watches on my left wrist, another on my right arm, a ring on my finger and a sensor embedded in my bra. No one should ever wear this many fitness trackers simultaneously. But in this moment, I am letting the latest heart-rate-sensing, sleep-capturing, workout-recording wearables from Apple, Fitbit, Garmin , Whoop and Oura capture all my data, to see which ones do the best job.
Whether you are training for a race or trying to lose the Quarantine 15, a fitness tracker can provide a helpful motivational nudge. But choosing the right one depends on your preferred activities and health goals—and requires an understanding of what data is most useful to you.