You’ve no doubt heard about the benefits of exercising, but have you ever thought of the risks of being a couch potato? You sit in your car to get to and from work. You sit at your desk all day. You sit in your comfy chair and watch TV at night. Is that a description of a typical day? If so, this should make you jump up in fear: About 10 percent of all deaths worldwide can be attributed to inactivity. One-third of all adults — that’s about 1.5 billion people worldwide — have a 20 percent to 30 percent greater risk of disease because they do not exercise at least 150 minutes a week. 80 percent of adolescents live a risky sedentary lifestyle and about 6 percent of coronary artery disease cases and 7 percent of type 2 diabetes cases are linked to lack of exercise. Physical inactivity also accounts for an average of about 10 percent of breast and colon cancer cases worldwide. In North America, 43 percent of adults are classified as inactive, compared with just 17 percent of Asians.