Fitness trackers have come a long way from the simple bands that tracked steps and little else. Modern trackers can monitor everything from your heart health to how well you’ve recovered from a hard bout of training. Even flagship smartwatches, which used to be lackluster trackers, have become pretty adept workout companions. Whatever your fitness goals are, there’s probably a fitness tracker that can help you achieve them.

Compared to some other gadgets, wearables are incredibly…