Childcare is definitely an issue in so many contexts, can definitely recognize that. Hopefully that's something more people are thinking about going forward with an eye towards the social value of it and the problems of people facing it in even non-epidemic situations.
But gains from no-commute / remote setups weren't limited to single/childless people. Some of the people I know who were taking rides / runs in the hills were couples with kids working schedules out with their partners, and I can think of families who demonstrated that reproduction doesn't bar one from buying home exercise equipment.
And "it became illegal to have anyone else look after our kids" -- I get that it's frustrating to have a service that you rely on closed. I can see that'd be especially hard with group daycare. I saw that frustration play out. I also saw people continue babysitting or au pair arrangements with whatever behavioral stipulations for epidemic-safety made sense to them, and that got easier as lots of people pulled out of service/retail labor force. Childcare was different but illegal seems like hyperbole.
I'm sure your experience was difficult or stressful; lots of people found adapting difficult in various ways (nor were single/childless people exempt, though the challenges might be different). But the idea that the parent poster forwarded that somehow civil policies generally "broke" people's health/exercise habits is a poor generalization... and whatever the truth about the difficulty of your particular situation, the idea that adapting was just impossible for people with kids and additionally that anyone pushing back on criticism of restrictions just isn't thinking about that doesn't hold up as a generalization either.