I remember going to a talk by a cardiologist who said he told patients to take the bicycle and sometimes they'd come back with a worse heart. Then it would turn

I remember going to a talk by a cardiologist who said he told patients to take the bicycle and sometimes they'd come back with a worse heart. Then it would turn out that those patients thought an electric bicycle is good too, since it looks like a bicycle and you have to use the pedals like a bicycle. But since you don't really exert yourself it doesn't help the heart. That was maybe 10 years ago, so electric bicycles were not so ubiquitous back then.