Idk I loved my hour of walking every day. My mental health tanked when I became full remote.
Wake, coffee, walk, start work at 9. Finish at 5, put computer away, and walk for 15 min, your day is done.
It's really arrogant how you assume you understand GP's situation better than themselves.
I used to bike commute about 7 miles each way up and down some intense hills; it was part of my routine, and I had to do it. Now that I'm working from home, sure, I could go out and ride 15 miles every day, but it becomes a matter of discipline.
Same with socializing. I tend to prefer solitude, so socializing, like exercising, now requires discipline – I have to make myself do it – whereas before it was baked in, and unavoidable.
People recommending a dog aren't wrong. I do have a dog now, and walk at least 5 miles a day. My dog is an idiot so I can't really do the dog-park thing, but if you have a non-idiotic dog, there's some socialization to be gained there, too. BUT: it's a big commitment, and will have an impact on big life decisions later on like what apartment you can rent, whether you live in a city or a suburb, how easy it is to take a vacation or travel abroad, etc., so it's not like it's a no-brainer or an easy solution.