Carley is a writer, editor and social media professional. Before starting at Forbes Health, she wrote for Sleepopolis and interned at PBS and Nickelodeon. She's a certified sleep science coach and ...

If you're a casual-to-obsessed observer of fitness trends, you may have come across “Zone 2” training—heard about it on ...

Zone 1 (55-65% of max heart rate): This is the "conversational pace" zone. You work at a light intensity, so you can easily chat without losing your breath. This pace is ideal for burning fat and is ...

Zone 3 training, or moderate intensity running, is not all junk miles. Here's how to use the grey zone to get the most out of every mile.

(Eliud Kipchoge's Zone 2 pace would be off the charts for most people ... the window if you've not had a maximal exercise test to measure your heart rate and ventilation for yourself,” he ...