The placement of a person’s belly button can be an indicator of what sports he or she will be good at, because it shows where a person’s center of gravity is. People who have a higher belly button have an advantage at running, for example, and people who have a longer torso and lower belly button typically are best suited for swimming. This is one reason why people of African descent typically perform better in running sports — their belly buttons are generally higher — and Caucasian athletes tend to do better in swimming competitions.
More facts about the belly button:
Innie belly buttons are much more common than outie belly buttons — only about 10 percent of people have outies, although about 30 percent of people are born with outies.
One of the ways to distinguish between identical twins is by their belly buttons, because they vary slightly.
Typically, people who have hairier bellies have more lint in their belly buttons.