Let's start with a sentence from the end of this article published on Nov 25, 2015 in the Scandinavian Journal of Medicine & Science in Sports: "People do not move, when you tell them to. People move when the context compels them to do so."
It should give a different meaning to the following, from the Introduction of the article:
"Physical activity represents a cornerstone in the primary prevention of at least 35 chronic conditions [...]. However, over the past two decades, considerable knowledge has accumulated concerning the significance of exercise as the first-line treatment of several chronic diseases. Of note, today exercise has a role as medicine in diseases that do not primarily manifest as disorders of the locomotive apparatus. When we selected diagnoses to be included in this review, we took into account both the frequency of the diseases and the relative need for exercise therapy. Twenty-six diseases covering various aspects of the medical curriculum are included. These are psychiatric diseases (depression, anxiety, stress, schizophrenia); neurological diseases (dementia, Parkinson's disease, multiple sclerosis); metabolic diseases (adiposity, hyperlipidemia, metabolic syndrome, polycystic ovarian syndrome, type 2 diabetes, type 1 diabetes); cardiovascular diseases (hypertension, coronary heart disease, heart failure, cerebral apoplexy, and intermittent claudication); pulmonary diseases (chronic obstructive pulmonary disease, asthma, cystic fibrosis); musculo-skeletal disorders (osteoarthritis, osteoporosis, back pain, rheumatoid arthritis); and cancer."