Following on from the earlier post on the dangers of sitting:

The first recorded anecdote of exercise as a treatment for heart disease is thought to be from William Heberden, who wrote of a man with angina pectoris in 1772: “I knew of one who set himself the task of sawing wood for half an hour every day, and was nearly cured” - Source

Something to consider during the ad breaks?

For a fascinating history of physical exercise as a preventative of heart disease I recommend this article.