Many of us know surprisingly little about the critically important organ inside our chest. So it's high time we learned a bit more about the heart – the impact running has on it, warning signs to be watchful of, and advice around HRV and max heart rate.

To explain all, leading cardiologist Dr Dan Augustine offers his expert insights into the heart.

Find out more about Dan's work at the following resources:

sportscardiology.co.uk

screenmyheart.co.uk

The NHS also offers a free NHS health check, which looks at heart disease risk, for those aged 40-74 and over:

nhs.uk

For additional heart health information, check out the British Heart Foundation website:

bhf.org.uk

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