Blaming women as a whole makes no sense to me.
And to add, if you go to less privileged neighbourhoods you'll see sports participation drop significantly, most don't do any sports at all. And the problems are much worse there. It might have been even worse if they did more sports, who knows, but I doubt it.
> According to the National Survey of Children’s Health, only 24% of youth ages 6 to 17 engage in at least 60 minutes of physical activity per day, down from 30% a decade earlier. B
https://www.aspeninstitute.org/wp-content/uploads/2019/10/20...
There was a TED Talk a few years back from a US Army General about how the terrible physical fitness of America's youth is becoming a national security problem.[1] I think the "low quality" of adolescent males over the past 2 decades is partly behind the push for more women in the military: we have so few physically-fit high-testosterone males that we have to cast a wider net and recruit physically-fit, comparatively-high-T females; they are better than soft fatbody guys. If boys were seriously engaged in sports at the rates that you are suggesting, teen obesity shouldn't be so widespread.