Stents are used in angioplasty, a procedure in which a balloon is inserted into a heart artery via a catheter and used to reopen it, alleviating chest pain, allowing patients to walk and treating heart attacks.

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Roger Swenson was only 40 when his heart was so weak he couldn't walk 200 feet without gasping for air.

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As you walk out of the lift your heart does a lurch.

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K. K. Harouni, who had been a polo and tennis player until he suffered a heart attack, seven years earlier, took a walk morning and evening, totalling exactly four miles each day.

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In fact, not just mental disorders, but all the illnesses of the modern world (e.g. heart disease, dementia, diabetes, cancer) seem to walk the same tightrope.

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So the goal is to walk a mile, and at the end, we have to measure our heart rate.

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Becker patients typically don't lose the ability to walk until their 20s and can live into their 50s or longer, although related heart problems can result in death earlier, according to Sharon Hesterlee, vice president of research at Parent Project Muscular Dystrophy, a patient group.

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Ms Cooper said government schemes encouraging children to walk or cycle to school would help to keep children active and cut the risks of heart disease and obesity in later life.

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Some 20 million Americans now walk around embedded with high-tech gear: artificial hips and knee joints, pacemakers, heart defibrillators and more.

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The planning white paper puts carbon reductions at the heart of the planning process and obliges local councils to plan new buildings to optimise people's ability to walk or cycle to work.

BBC: The La Rance tidal barrage near St Malo in Brittany