Understanding your heart rate is crucial for more than just reaching optimal fitness–it can also help to reduce injury and stress, and even predict illness ...

A peak flow meter is a handheld device that measures airflow rate and can help those with respiratory conditions like asthma monitor their condition.

Miralem Sabic Mika, known as the "Oxygen Man" in his native town of Konjic, has become a local hero for helping coronavirus patients breathe easier and comforting them with warm words and laughter.

A pulse oximeter is a device that clips on your finger, toe, or earlobe to measure blood oxygen saturation. Here's how it works and how to read it.