Friction is the force that tries to stop two materials that are touching from moving past each other.
Air resistance is friction between a moving object and the air. It reduces speed, which is bad for fast sports where a fraction of a second can make all the diffrence.
Friction between materials isn't always a bad thing, though it depends on the piece of equipment. If there were no friction between your shoes and the ground, you'd slip up when you tried to walk.
Designers try to minimise or maximise friction to get the best out of the equipment and sportswear.
If sports clothing is uncomfortable, it could be distracting and affect performance.
If the clothing is to heavy you need to put in extra effort to move around.
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