This is a finding that keeps coming up, and I've certainly found it true in my life, but there's a significant chicken-and-egg problem in that depression frequently precludes the motivation to exercise, and if you don't already have a deeply-disciplined routine to overcome the lack of motivation, people won't do it. Exhortation to develop those good habits in the good times, I suppose.
Motivation is fleeting but routine persists. When there is something that you want to do regularly (exercise, doing the final boring part of some sideproject, cleaning the house...) you remove willpower from the equation and set a day and a time. For example, everyday from 18 to 19 I work on my sideprojects, or saturdays from 16 to 18 is house cleaning time. There is no question if I want to do it, it is set at that…
List out what needs to be done every week, every month, every season, and set them up to repeat.
Every day you do your little two minute task (clean the bathroom mirrors; vacuum a single room), so you get a little win. And they’re each so small that it never feels like you need to switch into a long “cleaning binge” that you need to dread.