While checking your heart rate gives you a good indication of how fast your heart is beating, it may not be the best measure.
Dr Bhushan said: “Heart Rate can be a measure of your effort levels, since it is influenced by so many other factors.
“However, it actually turns out that your Breathing rate is a much better measure of your effort levels than heart rate.”
Dr Bhushan recommended having an electrocardiogram (ECG) instead.
He said: “An ECG is a simple test that can be used to check your heart s rhythm and electrical activity.
“Sensors attached to the skin are used to detect the electrical signals produced by your heart each time it beats.”