What do you think of my addition SJ? I added it because there are sports activities for girls that are not competitive, or team oriented, nor a cathartic outlet for aggression in a controlled environment.

For others, notice that in all women's sports, the women are scantily dressed. Even in women's pro football where you would think they would be covered for protection, they play bare butt. Look at track, bare butt. Tennis...… There is a reason for that, it is to attract men to the "sport". Why would anyone go to watch woman's highschool/college/pro sports except they be parents or relatives? It is like going to watch a pro football game between men with their ankles tide together, or other handicap. That is the reason for the bare butt and exposed breasts outfits. It is of course of the devil. Also, because of the aggression in competitive sports it attracts an abnormally high percentage of lesbians to play or watch/stalk. I have a relative who's daughgter played on the highschool volleyball team and I was at his house once when the girls were all there. I smelled something wrong, and over time found that many of them were indeed lesbians, maybe the majority.

LT-

Yes, I agree with your qualifier that women should not play “competitive” sports.

That -combined with truly modest attire- would preserve a true feminine psyche, and protect against inculcating masculinity in girls.

Let’s not forget Cardinal Siri’s exhortation to his flock in Genoa, Italy in the early 60s.  He was warning of the psychological evils of women wearing men’s attire (ie pants).  This was an evil, he said, even if the attire was not necessarily immodest, because it was an attack on femininity itself and of the social order, and the family.  
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Does this psychological attack on femininity (and by extension, the family) also apply to the idea of women playing sports “like men”? Of course.  
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Women in sports should be isolated to such things as gymnastics, ice skating or anything which involves the improvement of their natural grace, beauty and inclinations.  It is not natural for women to compete with each other physically or in the aggressive manner that most “male invented” sports require.  Such sports were created by men for a reason and winning requires male behavior and male ideals. 

Papal Decree Concerning Modesty,
POPE PIUS XI, 12 January 1930
http://www.olvrc.com/reference/docuмents/Modesty.Pius.XI.pdf

3. Let those same parents prohibit their children from public athletic events and gymnastics competitions, or at least, if their daughters must be involved in them, that they take care to exhibit clothing which is fully in keeping with modesty and that their parents never permit them to wear immodest clothing.

Did you see the the "public" part?  I bolded it for you in case your eyesight was wanting.  You ignored this.  "Public" is also stipulated by Pius XI in Divini Illius Magistri.  Learn how to read, people, before you hurts yourself attempting to reason.

Some of you guys are ridiculous, and singlehandedly responsible for making Traditional Catholics look like nutjobs.

There's no way that some volleyball games played during a gym class at an all girls school leads to "masculinized" women.  That's just insane.  Playing hockey or football or playing against boys, certainly.

And to imply that it's practically the same thing for a girl to not be in perfect conformity with the rules of modesty when in the company of other females, especially when the nature of the activity makes it difficult or cuмbersome, that it's practically the same thing as running around naked in front of men ... that's also insane.

This stuff is just nuts.

When you get this unreasonable and insane, 90% of the time this comes from an at-least latent misogyny, which in turn usually derives from insecurity of some kind that I need not further elaborate on.

And, finally, these uniforms in the pictures, are really NOT THAT BAD for what they are.  If these girls were to stand up, they probably hit right at or just slightly above the knee.

Perhaps you have daughters who played sports?

The public vs private distinction pertains to modesty, but not to femininity.

Siri and others have written about the deleterious and masculinizing effects of men’s attire and sports upon the feminine psyche (and it applies whether girls wear or do these in public and private).

To illustrate:

If I like to wear women’s panties in private, and paint my toenails, and wax my eyebrows, and do embroidery and sew, it would all still be damaging my masculinity despite being in private, because these behaviors would be inculcating within me a feminine psyche, to the detriment of my God-given masculinity.

Same thing with women inculcating themselves with masculine behaviors (whether public or private).

That public v private distinction only pertains to the modesty issue, not the femininity/masculinity issue.

If you can’t see this, it is only because you don’t want to.

Some of you guys are ridiculous, and singlehandedly responsible for making Traditional Catholics look like nutjobs.

There's no way that some volleyball games played during a gym class at an all girls school leads to "masculinized" women.  That's just insane.  Playing hockey or football or playing against boys, certainly.

We're not talking about a private game of volleyball or some "pick up" game where the girls are playing in gym class.  We're talking about a PUBLIC HIGH SCHOOL game, where HUNDREDS of people are present (or could be) to watch.  You keep inserting imaginary factors into a clear-cut, factual case of a PUBLIC SPORTING EVENT.
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And to imply that it's practically the same thing for a girl to not be in perfect conformity with the rules of modesty when in the company of other females, especially when the nature of the activity makes it difficult or cuмbersome, that it's practically the same thing as running around naked in front of men ... that's also insane.

Ladislaus, have you ever been to a high-school or club sporting event?  The attendance is OPEN TO THE PUBLIC.  These games are not being played "in the company of other females" only.  Your arguments are borderline insane.  That, or you're just so sheltered that you have no experience of what these games are all about or the atmosphere surrounding them.
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And, finally, these uniforms in the pictures, are really NOT THAT BAD for what they are.  If these girls were to stand up, they probably hit right at or just slightly above the knee.

The 'above the knee', non-Trad skirts are the least problem with this whole scenario.  The overall problems are
1) supposedly "Trad" girls playing with non-Catholic novus ordo girls in a competitive style sport, while being coached by a novus ordo coach who will not support Trad ideals or goals.
2) supposedly "Trad" girls being allowed to act like they are just one of the "normal schools" and be in association with the novus ordo diocese.  Just another example of the new-sspx watering down and slowing compromising the former-Trad ideals which we should all be striving for.
3) the idea that one can compromise modesty (in any degree) for a non-emergency situation...especially one as superfluous as sports.  It's the allowance of a "lessening" of standards is the problem.
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Are we Traditional Catholic or not?  Can these young people even define what "Traditionalism" is?  Or explain why we are what we are?  Being able to modify such actions when in a "public" arena gives more credence to the error that the only thing that separates Trads from other catholics is the "latin mass".  This situation is a perfect time to explain to the youngsters that we are not "of the world" but only live in it.  Life's not easy; the road to Calvary requires sacrifices.  It should be an honor to uphold Catholic ideals and to suffer and set an example.
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He that is faithful in that which is least, is faithful also in that which is greater: and he that is unjust in that which is little, is unjust also in that which is greater. (Luke 16:10).

3. Let those same parents prohibit their children from public athletic events and gymnastics competitions, or at least, if their daughters must be involved in them, that they take care to exhibit clothing which is fully in keeping with modesty and that their parents never permit them to wear immodest clothing.

Right, Ladislaus, we're talking about a PUBLIC sporting activity.  What part of a public volleyball game do you not understand?  What part of "fully" keeping modest, don't you understand?  Having skirts above the knee while "not that bad" is not "fully keeping with modesty"...especially in the PUBLIC realm.