Training zones are based on your heart rate, but each app has its own idea of where they start and end. It seems no one can even agree on what, say, Zone 2 cardio even is. Here's why.

You probably work your biceps and triceps on arm day, but are you remembering your forearms, too? Here’s a guide to the best ways to work them.

Just want a fitness tracker, but don’t know where to start? Here are our picks for the best Fitbit, the best Apple Watch, and the best budget option.

Surprise! The biggest calorie burn doesn't come from exercises that feel the hardest. 

These are the best fitness trackers for runners, including the best Garmin, the best budget Garmin, and the underdog favorite you’ve probably never heard of.

When it comes to choosing a fitness tracker or smartwatch to track your sleep, the Oura ring and Whoop band dominate, but I have a favorite smartwatch to throw in the ring as well.