OP here, thanks all, especially for the link to the DCPS physical education page. It's much more structured than I realized and I guess that as a PP said, the days of kickball on the playground are over:
The PE education has shifted from a competitive environment to one that is more inclusive and focuses on cooperative challenges, social interaction, self-expression and realizing personal goals while developing students’ intrinsic motivation to engage in physical activity.
I wasn't really complaining, just curious more than anything else. I do think the more outside time, the better, especially in nice weather. (Both for mental health reasons and because studies have found that kids are less likely to develop myopia if they spend more time outside.) But as I said before, my kids like PE so staying indoors isn't that big a deal.