The feminist movement in the world is not just about social life but also about physical abilities and sports. Hotheads even call for co-ed athletic competitions without gender separations. Usually, such appeals come from circles far from a real sport or from young female athletes successfully competing against boys. The most striking example is freestyle wrestling, incredibly popular sport among girls in USA. Girls and boys younger than 14-16 quite often meet each other on the mat and girl's victory is not a surprise anymore. Let's consider a real correlation of capability of boys and girls in wrestling based on the study accomplished in USA.
As a matter of fact, girl wrestlers demonstrate impressive success competing against boys (especially in the weight categories below 55kg and younger ages). Girls reached the finals and even became winners in regional boys' competitions (mainly in categories below 55kg). For instance, Michaela Hutchison became Alaska champion among boys at the age of 16 and Alena Kocharovskaya (Russia, Volgograd oblast) at the age of 14 became a Judo champion in a boy championship in her local town. This is why some feminists cherish hopes for overcoming gender differences in physical abilities which they consider as a result of upbringing. They suggest that girls won't be second to boys if they are brought up in the same conditions as boys.
Let's look into the facts and realities.
If you review the statistics of boy vs. girl wrestling matches, girls are more or less successful only in lower weight categories and younger ages. The higher weight category, the harder for a girl to withstand a guy in a combative sport, even though the girl is perfectly trained and masters of the wrestling techniques.
The pattern of physical development of girls changes with the age and vary for different girls. For the most of girls puberty begins about two years earlier than for boys. Normal growing girls by the age of 14 become sexually mature women ready to give birth. Hormonal status changes respectively and a pubescent or postpubescent girl who had excelled male peers before gets inferior to boys in physical strength. In the postpubescent groups, more differences exist between genders, comparing to the prepubescent and pubescent groups This pattern is underlying for traditional programs of school physical education in which different qualifying standards apply to girls and boys. However, there is more rare non-standard (non-typical) sexual development of children including the girls. There are girls named "tomboys". The reason is in intrauterine conditions of maturing when the fetus receives influence of the increased level of androgens of the mother. It can be because of reception of some medicines, and can be a biological feature of such women. As a result, such a girl grows faster than boys and develops in the male pattern, By 14 - 16 such masculinized girls have significant advantage over boys and this advantage can remain even later. While boys come to wrestling teams not just due to inclination for physical combat but also by tradition and family upbringing, regardless of athletic talents, girls usually come to contact sports mostly because such activities fulfill themselves and they can consume their excessive physical strength. So, girls having some psychosomatic deviations toward masculinity make the backbone of girls wrestling teams.
Mixed gender wrestling training and competitions (coed) are allowed in many American high schools where boys and girls may wrestle each other. Here is the statistics setting out all the 2007/2008 HS brackets in Wisconsin. It is consistent with what was found in 2009 for the state of Maine. They are as follows:
In 2008 there is evidence of 203 mixed gender bouts in Wisconsin within all the 14 traditional weight categories. Out of them the boys won 170 (84% of mixed gender bouts) and the girls 33 (16% of mixed gender bouts). 128 out of these 203 bouts ended up with pins. The boys pinned the girls 110 times (86%) and the girls pinned the boys 18 times (14%).
The respective gender performances in each weight category were as follows:
103 lbs (104 bouts): boys win 86 times (83%),
girls win 18 times (17%)
112 lbs (47 bouts): boys win 38 times (81%),
girls win 9 times (19%)
119 lbs (26 bouts): boys win 22 times (85%),
girls win 4 times (15%)
130 lbs (12 bouts): boys win 12 times (100%),
girls win 0 times (0%)
135 lbs (7 bouts): boys win 6 times (86%),
girls win 1 time (14%)
152 (7 bouts): boys win 6 times (86%),
girls win 1 time (14%)
A similar pattern is seen at the US national level. The study has covered the most of the US states covering 80% of the US population. There were 129 matched between best girls (1% of girl wrestlers) and best boys (12% of all boy wrestlers). Boys won in 86 matches (two third) and girls won in 46 matches (third). 58 matches out of 129 finished with a pin. A boy pinned a girl 46 times (~80%) and a girl pinned a boy 12 times (~20%). So, there were 4 time more pins by a boy than by a girl.
In the considered states, 23,000 out of 250,000 high school wrestlers have been qualified at state levels in co-ed wrestling competitions, including just 46 girls. So, less than 1% of all available 5,000 girl wrestlers reached the state level, whereas 12% (out of 195,000) boys did. Such a big gender gap exists in co-ed high school wrestling. By the way, all 46 girls wrestled in categories 54kg.and lighter.
None of female national champions in wrestling have managed to reach the national level participating in boy's/men's teams – neither in high school teams nor in varsities. Moreover, none of university female wrestlers managed to reach state level.
This pattern is even more convincing if you consider some advantages, which girls (of age 14-16) have over boys in wrestling. Girls can maintain lower weight classes later in life, thus giving them more experience. Besides, girls have a lower center of gravity and it’s harder to take them down or throw them.
The bottom line is that despite aggressive ideological pressure from the feminist movement, it is impossible to overcome gender polymorphism caused by the human biological nature. Women will never be capable to compete against men on equal footing on the same sport playground, boxing ring or wrestling mat.