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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Understanding our body’s target heart rate zones and how they change as we age is crucial for getting the most out of our workouts ...

It's healthy to know your numbers. Learn about resting and maximum heart rates, exercise targets, and when to consult a doctor about heartbeat irregularities.