> Depression can be caused by a chemical imbalance

And yet many other times, it can be caused or exacerbated by situational and psychological factors, including "being stuck at home all day".

> One of the most frustrating things when your really low is people giving advice like do exercise to feel better - please don’t do this.

Worse, antidepressants actually cause significant harm to many people who take them, often without even improving their depressive symptoms. This is very bad, and I would say significantly worse than giving general advice that might be inapplicable to some people.

There's no one-size-fits-all solution, and some people probably are legitimately just in need of more motivation to go running or biking or whatever else will get them the exercise they need.