In human biology, footedness is the natural preference of one's left or right foot for various purposes. It is the foot equivalent of handedness. While purposes vary, such as applying the greatest force in a certain foot to complete the action of kick as opposed to stomping, footedness is most commonly associated with the preference of a particular foot in the leading position while engaging in foot- or kicking-related sports, such as association football and kickboxing. A person may thus be left-footed, right-footed or ambipedal (able to use both feet equally well).
Ball games
In association football, the ball is predominantly struck by the foot. Footedness may refer to the foot a player uses to kick with the greatest force and skill. Most people are right-footed, kicking with the right leg. Capable left-footed footballers are rare and therefore quite sought after. As rare are "two-footed" players, who are equally capable with both feet. Such players make up only one sixth of players in the top professional leagues in Europe. Two-footedness can be learnt, a notable case being England international Tom Finney, but can only be properly developed in the early years. In Australian Rules Football, several players are equally adept at using both feet to kick the ball, such as Sam Mitchell and Charles Bushnell (footballer, retired).
In basketball, a sport composed almost solely of right-handed players, it is common for most athletes to have a dominant left leg which they would use when jumping to complete a right-hand layup. Hence, left-handed basketball players tend to use their right leg more as they finish a left handed layup (although both right- and left-handed players are usually able to use both hands when finishing near the basket).
In the National Football League, a disproportionate, and increasing, number of punters punt with their left leg, where punting is the position in play that receives and kicks the ball once it leaves the line of scrimmage. At the end of the 2017 NFL season, 10 out of the league's 32 punters were left-footed, up from four out of 31 (not counting dual-footed punter Chris Hanson, who left the league in 2009) at the beginning of the millennium; in contrast, placekickers were almost exclusively right-footed. The only apparent advantage to punting with the left foot is that, because it is not as common, return specialists are not as experienced handling the ball spinning in the opposite direction.
Boardsports
In boardsports (e.g., surfing, skateboarding and snowboarding), one stands erect on a single, lightweight board that slides along the ground or on water. The need for balance causes one to position the body perpendicular to the direction of motion, with one foot leading the other. As with handedness, when this task is repetitively performed, one tends to naturally choose a particular foot for the leading position.
Goofy stance vs. regular stance
Boardsport riders are "footed" in one of two stances, generally called "regular" and "goofy". Riders will generally quickly choose a preferred stance that becomes permanently preferred. A "regular" stance indicates the left foot leading on the board with the right foot pushing, while a "goofy" stance leads with the right foot on the board, pushing with the left. Professionals seem to be evenly distributed between the stances. Practice can yield a high level of ambidexterity between the two stances, such that even seasoned participants of a boardsport have difficulty discerning the footedness of an unfamiliar rider in action.
To increase the difficulty, variety, and aesthetic value of tricks, riders can ride "switch stance" (abbreviated to "switch"). For example, a goofy-footed skateboarder normally performs an ollie with the right foot forward, but a "switch ollie" would have the rider standing with the left foot at the front of the board. In sports where switch riding is common and expected, like street skateboarding, riders have the goal of appearing natural at, and performing the same tricks in, both regular and goofy stances. Some sports like kitesurfing and windsurfing generally require the rider to be able to switch stance depending on the wind or travel direction rather than rider preference. Each time direction is changed, the stance changes. Snowboarders who ride switch may adopt a "duck stance", where the feet are mounted turned out, or pointed away from the mid-line of the body, typically at a roughly 15-degree angle. In this position, the rider will have the leading foot facing forward in either regular or switch stance.