How to Decide Which Fitness Tracker to Buy

Turning your daily actions into data can motivate you — at least, that's the dream behind many quantitative self devices that help you track fitness, movement, what you eat and how you sleep. Many of these devices are wristbands and most offer the same basic features, and come with a companion iOS or Android app that will help you make sense of the data. But of course, there are nuances

Our Twitter Advice Column, #MashAdvice, helps you navigate digital questions related to relationships, productivity, fitness and more. Your answers will come from people who have experienced the very same issues firsthand. Read more...