Scientific studies say that organs that are not used atrophy, and over time may disappear. That's why my sport would be something to do with the little fingers of the hands, which are generally rarely or never used.
Making figures with threads using only the little fingers, would not only serve to give mobility to this part of the body, but it would also help a lot to exercise the mind, because creativity and speed in the designs would be valued.
How to play it?
Take a strip of one meter in size, fold it in half and knot it. Then with the little fingers form a figure, turning the thread as many times as necessary, in one minute of time.
It would be practiced from childhood, and the best would go to the Olympics!
Something like this, but only with the little fingers.