I'm curious where you live because my kids and everyone around is effectively plays outdoors all day. Going on bike rides, walks, scootering, playing in the woods, these are all excellent choices right now. Perhaps you meant organized sport play?
Out in the sunny south, but 'outdoors' is still seen as a risk in my circles. Outdoors has a probability of getting within 6 ft of someone not wearing a mask.
Plus with 2 jobs and young kids there is only so much that can be done without supervision.
Given the science around the virus dying in sunlight and heat, and the lack of a single confirmed case contracted outdoors, I suggest that your circle is misinformed. :-)
I'm also in the South, and there's plenty of outdoor activity going on!
True on the probability, but outdoors appears to be huge risk mitigator and is important enough to my own health and sanity that I will risk it regardless.