Amongst all that data are your heart rate (HR) zones and training zones. But what are they, and what do they really mean? Here, we unpack these zones, discuss their reliability, and explore how they ...

One Garmin user has revealed how a rogue max heart rate setting led to months of frustration and no progress working out.

Enthusiasts claim that these long, slow workouts could be the key to longevity and better health. Here’s what the science ...

Zone 2 training increases the number of mitochondria you have and how efficiently they can work, as it stimulates the production of oxygen by using it (and fat) for fuel. On the other hand ...

"Another benefit is the activation of the cell's mitochondria. Zone 2 training is effective for improving mitochondria function as well as increasing the number of mitochondria in the cells.