Just an FYI, telling someone with diagnosed chronic or severe depression that they need to get out more or exercise to feel better is about the same as saying, "Buck up!" It typically has a negative affect rather than a positive one.
Yeah, exercise and getting out more helps, but depression isn't just being sad. So rather than say 'hey do some yoga, exercise, be physically fit and you'll feel better!' Offer to go for a walk together or do something together. Motivation is an issue when depressed and even as often as you see articles on it and how mental illness is still stigmatized yet talked about, people don't understand it and I get people are trying to be helpful and upbeat to help the person that is depressed but many times it is going to backfire. We don't need to be reminded that for everyone else it's a matter of 'bucking up.'
Me: Late 30s pansexual poly.
DH: My husband of 19 yrs and father of 3 teen girls.
DC: LDR of +4 year