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.”