In TODAY.com's Expert Tip of the Day, a cardiologist explains how to slow down a racing heart in times of stress.

There are many tools available to check your heart rate, but if you don’t have one, you can still obtain an accurate reading using your pulse and counting in your head or using a stopwatch or timer.

A lower resting heart rate can indicate your heart is more efficient. Cardiologist explains normal resting heart rate and how to lower it with exercise.

A heart rate that averages above 100 beats per minute is called tachycardia. You can develop a high heart rate because of ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." When I first started running, I always tried to aim to run at a fast pace, which constantly made me feel ...

When I first started running, I always tried to aim to run at a fast pace, which constantly made me feel out of breath and exhausted. But then I learned to focus on a different metric that would make ...