Exercise and in particular high intensity interval training, aka, HIIT, is an ideal way to boost the ability of mitochondria, the power houses of our cells, to generate energy. Mitochondrial activity declines with age, which may contribute to fatigue and loss of muscle size.

As anyone who has ever tried it will tell you, HIIT isn’t pleasant but it is effective. As the name suggests, it involves short bursts of intense exercise broken up by spells of recovery. In a group of 65 to 80-year-olds, scientists found that three months of interval training boosted the energy-generating capacity of their mitochondria by 69 per cent. Lung, heart and circulation health also improved dramatically in the HIIT devotees. What are you waiting for, HIIT out at ageing?