Runna has sparked curiosity—and criticism. Running isn’t exactly my preferred method of cardio. I was a swimmer all my life, ...

I signed up for my first trail race and let a running app guide my training, from base building to the finish line. Here’s how it all played out.

A smartwatch maker and a popular running app are locked in a legal dispute -- and if it ends badly, runners are wondering how this will affect their ability to track their runs.