The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is always at work. It pumps blood through arteries to deliver oxygen to organs and ...

A fast heartbeat can be caused by emotions like stress or anxiety. Dehydration, or drinking caffeine or other stimulants, can ...

That little number on your fitness tracker might be more important than you realize. Your resting heart rate isn’t just some random vital sign. It’s essentially a window into how efficiently your ...

Many people don’t realise that temperature plays a major role in how the heart responds to exercise. These different reactions to hot and cold temperatures may not be immediately evident, but they ...