Light exercise includes activities that do not cause you to break a sweat or produce shortness of breath. An example would be a leisurely walk or casual bike ride. Moderate exercise is exercise which causes you to break out in a light to moderate sweat or makes it difficult to carry on a long conversation. Good examples would be a
brisk walk, hiking on a nature trail, performing chores around the house. Heavy exercise causes you to sweat profusely and makes it difficult to carry on a conversation of any length. Some examples would be running around a track, heavy manual labor, or heavy weightlifting.