Picking the right fitness tracker isn’t that hard. They not only help guide exercise workouts such as running, swimming, or cycling, they can also help you and your health care professional understand your medical situations, such as detecting irregular heart rhythms. And they can help in more day-to-day activities, such as weather reports and calendar alerts. Shopping for a new fitness tracker can be a daunting task. There is a wide range of brands and price points to choose from. Fortunately, you can use a handful of key points to narrow your choice.