A lifestyle devoid of physical activity is usually described as sedentary, as for example in this Wikipedia article on Sedentary Lifestyle.
What happens when there is no physical activity or exercise?
Not getting enough physical activity can lead to heart disease—even for people who have no other risk factors. It can also increase the likelihood of developing other heart disease risk factors, including obesity, high blood pressure, high blood cholesterol, and type 2 diabetes.
Do some people not workout?
Time. The most common reason people give for not exercising is that they simply do not have the time for it. Whether it is due to work, family, children, or a combination of these, you may say that exercise just does not fit into your busy schedule. ... Schedule a time each day for exercise.