Which sports equipment is designed using science?

Basically I need a sports equipment which is designed using science. Is there any sport equipment which is designed using science. Well without a doubt there is but I need assistance suggesting which ones and how.
Answers:
All machines are "designed using science." What do you really mean? Behind every training machine within is a mechanical engineer.

Science is the process of attaining organic knowledge.
almost any of it.
one example: a mountain-climbing cam.
another: a 10-meter (?) sailboat suitable for America's Cup racing

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