At the turn of the 20th century, obesity was far more rare a problem than it is today, as were the associated medical conditions which often result such as diabetes and high blood pressure. The reason, many biologists and MD's now believe, was a much more active lifestyle driven by agricultural and industrial jobs that required higher levels of physical activity than desk jobs of today. In addition to long hours of sitting at work, the lure of TV, video games, and the internet keeps us more sedentary than ever before. Recent studies have shown that Americans spend an average of 9.3 hours per day sitting on their asses, which is an hour and a half longer than we spend sleeping each night.