This type of exercise:

  • uses large muscle groups, such as your legs or upper body
  • requires respiration or controlled breathing
  • increases your heart rate and keeps it in an aerobic zone for a set amount of time

Common forms of cardio include walking, jogging, swimming, cycling, and fitness classes. Cardio machines may include a rower, elliptical, stair climber, upright or recumbent bike, and treadmill.