As far as I know, while a sedentary lifestyle leads to or exacerbates the physical deterioration which leads to death by heart disease, I do not think slowing d

As far as I know, while a sedentary lifestyle leads to or exacerbates the physical deterioration which leads to death by heart disease, I do not think slowing down brings it on, at least within a couple of years. For people at high risk, unaccustomed exercise is recognized as a trigger of acute disease (with snow-shoveling being a well-known example.)