Now we have often heard it said, "be a sport." 'Sportsmanship' expresses an aspiration or ethos that the activity will be enjoyed for its own sake, but often the pressures of competition, individual achievement, or introduction of technology can seem to work against enjoyment by participants.

People responsible for leisure activities often seek recognition and respectability as sports by joining sports federations such as the IOC, or by forming their own regulatory body.

In this way sports evolve from leisure activity to more formal sports: relatively recent newcomers are BMX cycling, snowboarding, wrestling, etc. Some of these activities have been popular but uncodified pursuits in various forms for different lengths of time. Indeed, the formal regulation of sport is a relatively modern and increasing development.

Sportsmanship, within any given game, is how each competitor acts before, during, and after the competition. Not only is it important to have good sportsmanship if one wins, but also if one loses. For example, in football it is considered sportsmanlike to kick the ball out of play to allow treatment for an injured player on the other side. Reciprocally, the other team is expected to return the ball from the throw-in.