There is one reason, and many people will give one reasons. People with an average development do have have an excess of energy especially if they do not have physically demanding work.
Team sports provide some role play benefits in terms of improvements to co-operative technique, though it is often viewed that it is the excitement of the competition, and the adoration of peers given to winners which is a prime motivator.
In many ways sport is practice to help with real life situations.
Satisfaction comes from endorphins released from exercise. Nature has a way of drugging us to like exercise. It may be that this is the only reason and that all other reasons are secondary being reinforced by the pleasure feeling.
In other words it feels good.
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