I do hold that direct competition between boys and girls is wrong.
So, for instance, there should be no spelling bee that includes boy and girls competing against one another. Girls should not compete against boys.
But I do not hold that it's necessarily wrong for girls to compete against one another.
Nor do I hold that vigorous physical activity is wrong for girls either.
But, now, the current argument is that vigorous physical activity combined with competition is wrong because it excites the passions.
But, then, to the contrary, any kind of competition can excite the passions, get people worked up against one another, hostile, etc. ... shirt-removal notwithstanding.