Attention marathon runners, triathletes and other endurance athletes: If you’re after a high-end sports watch, minus the upkeep and fancy smartwatch tech, the Garmin Enduro 3 is for you.

First they came for our wrists, now wearable innovators want to adorn our digits with sensor-laden trackers. And if you’ve always fancied daily health insights and advice in a more discreet package ...