iPhone Fitness Electronics

Learn how to train using a heart rate monitor, what your HR max is and how to determine it, and how to calculate and use heart rate training zones.

Learn about speed and distance monitors, GPS fitness trainers and heart rate monitors so you can choose the right one for you.

How much do runners, cyclists and other endurance athletes really have to gain from training based on their VO2 Max?

A fitness watch is a valuable tool for trail running. Learn some features that can help you become a better runner and have more fun on the trail.

Learn what VO2 max is, how you can measure it and why it’s key to improving fitness. Also get tips on training routines that can help you improve it.