I just realized you are not of this world...
You should have become a Holy religious Monk.
I've been to countless church picnics and graduation parties where volleyball is played by men and women. The games were filled with athleticism and great play. Women didn't need to dive around on the ground to help win. (And most men who were good knew how to anticipate the next shot and moved their feet instead of diving on the ground, which is not that efficient of a play).
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The overarching question is: What role does sports play in society? Is it being played for fun, for exercise...or for some other reason? You can't bend the rules of modesty (in either gender) just for sport's sake. "Well, I could play better if I was wearing different clothes." Ok, probably true. But how important is competition and winning, as compared to modesty and scandalizing our neighbor, not to mention our own soul?
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Until we realize that sports is one of the gods of modernism (along with technology, food, health, fitness and entertainment), then we can't see that to lower our modesty standards for sports is a huge problem.