What is a Cardio Workout and Why It Matters Understanding the Science Behind Cardio When people hear the term cardio workout , they often picture sweating on a treadmill or running endlessly outdoors. But cardio, short for cardiovascular exercise, is much more than that. It refers to any physical activity that raises your heart rate and keeps it elevated for a sustained period. This process strengthens your heart, lungs, and circulatory system, making your body more efficient at delivering oxygen to muscles. Think of your heart like an engine. If you never push it beyond idle mode, it stays weak and inefficient. But when you engage in cardio exercises—whether it's jumping jacks, brisk walking, or cycling—you’re essentially training that engine to perform better under pressure. Over time, your resting heart rate decreases, your endurance improves, and your body becomes a fat-burning machine. From a physiological perspective, cardio triggers the release of enzymes that help break...
Fat to Fit in 360 Days.