But some claim that the trending "Zone 2" training, commonly known as the "fat-burning zone," offers just that. "Zone training is generally defined by someone's proximity to their maximum heart ...

Zone 3 is kind of like the goldilocks of run training: It’s not too fast and not too slow. Instead, it’s an in-between effort often described as “comfortably hard.” “Zone 3 training is ...

But some claim that the trending “Zone 2” training, commonly known as the “fat-burning zone,” offers just that. What is this form of exercise — and can it work for anyone? “Zone ...