The AKC describes the Labrador's temperament as kind, pleasant, and outgoing. Labradors have a reputation as a very even-tempered breed and an excellent family dog. They instinctively enjoy holding objects and even hands or arms in their mouths, which they can do with great gentleness. A Labrador can carry an egg in its mouth without breaking it. They are known to have a very soft feel to the mouth, as a result of being bred to retrieve game such as waterfowl. Labradors must be properly exercised and stimulated. A healthy Labrador can do swimming wind sprints for two hours, and should keep a very slight hourglass waist and be fit and light, rather than fat or heavy-set. Labradors should be walked twice a day for at least half an hour.