In today’s healthcare landscape, the role of physical activity is being profoundly redefined. Especially across the U.S. and Europe, more families and physicians are viewing movement not as a luxury for gym-goers or athletes, but as a first-line clinical intervention. For a cardiologist who has run a private practice in Los Angeles for nearly two decades, the most common scenario is this: a middle-aged man comes in with elevated cholesterol, early-stage hypertension, or erratic blood sugar levels. The first “prescription” is not a drug—it’s a tailored plan for physical activity. That’s because, whether for short-term mental improvements or long-term disease prevention, a consistent and well-structured physical activity routine delivers measurable health benefits. Take, for instance, a 45-year-old IT engineer in Minnesota. Years of sedentary desk work and poor diet led to a 20-pound weight gain and borderline blood sugar levels. After his doctor prescribed a walking re...