Add Yahoo as a preferred source to see more of our stories on Google. Zone 2 cardio rate training means working in one of five heart rate zones at 60-70% of your max heart rate. "Zone 2 is where the ...

‘Comfortably hard’ sounds a bit like a contradiction in terms, yet that’s the feeling you’re looking for when you start thinking about thresholds. It’s helpful for runners to know where their lactate ...

Heart rate zones represent different percentages of your maximum heart rate. They can help guide the intensity and effectiveness of your workouts. The benefits of exercise are widespread and include ...