https://www.anytimefitness.com - In a world with so many different options for fitness, there is generally something out there that works for everyone. Cardio covers a lot of ground in the fitness space, from participating in a local basketball league to running sprints on a treadmill. Before we dive into making your cardio workouts as effective as possible, we’re breaking down the what of cardio. “Cardio,” as it’s commonly referred to, is an exercise that elevates your heart rate and stimulates the cardiovascular system. Think of the heart similarly to other muscles in your body. The more you work it, the stronger it gets, which makes it easier to pump blood through the body.