Cardio is actually the shortened form of cardiovascular, which basically represents anything having to do with your heart and the way it functions. Since the heart is the most important organ in our body, cardio exercises have always been a favored recommendation by doctors. Some examples of good cardio exercises, which are known as aerobics, are speed-walking, jogging and swimming. The fitness market these days is swarming with various cardio exercise machines that are good for raising your heart rate and keeping it elevated for a period of time. Some exercise equipment that is available here at Fitness Direct in San Diego are various types of cycles, elliptical trainers, rowers, stair climbers, and treadmills.