Timeline view for your outdoor activities, climb alerts for rides, and new ways to control your watch with your voice.

Training or racing at altitude introduces specific challenges to performance and recovery. Here’s how oxygen availability changes, how to prepare if you’re heading to altitude, and why many elite athletes choose to live and train at elevation.

Knowing the difference between ideal and adverse conditions helps focused athletes to make improvements. Here are a few tips to help you perform when the temperature soars.

Stay on track, and on trail with these tips

As Molly's shares, sometimes the only way to find out who you are is to let go of who you were.