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We have a little home gym, and I do a 20-minute, brutal, fast-paced blast on the elliptical machine to make sure I get my endorphins up and my cardiovascular system going.

“The heart and cardiovascular system are working harder because, to some extent, they’re supporting two lives instead of one.”

Previous studies have shown that exercise in leisure time is more beneficial for the cardiovascular system than physical activity at work, which can even be detrimental to health.

"I sent all the information I had to Professor Clyde Williams at Loughborough University, who specialises in sports science, and he said there were clearly a number of weaknesses in Jimmy's cardiovascular system."

There are some, like haemoglobin levels, certain elements of the cardiovascular system that may go away.