Over the past couple of years, fitness trackers have become more popular, and more advanced than ever.

They can tell you how much activity you've done, how you've slept and what your heart is up to.

But how much should we rely on the information from the thing on our wrist? And, when should we maybe chat to a doctor?

To celebrate World Heart Day, Professor David Burke, Director of Cardiology, Consultant Cardiologist at Beacon Hospital, joined Dermot and Dave to explain the pros and cons of fitness trackers, and to give some general tips on heart health.

You can catch David's tips by clicking play above.