TRAINING WITHOUT TRACKING is like shooting a basketball without knowing where the hoop is, especially if you have an ultimate goal like running a marathon or increasing your VO2 max. Many people come ...

Heart rate zones are a way to describe how hard you're working during a cardio workout, like running or cycling. The faster your heart beats, the harder you're working. So an easy jog might have you ...

You can also test the accuracy of your numbers out on the run, for example by running at what feels like a hard pace (using the ‘talk test’, you should only be able to get two or three words out at a ...

To get a sense of what average running heart rates look like for the pros, we peeked at some of their public Strava posts.

Heart rate variability (HRV) is the variation in the time between two consecutive heartbeats over a specific period. Doctors may use HRV as an indicator for certain aspects of a person’s health, ...