As someone who spends 10+hr a day working outside I can assure you that being outside and doing physical activity does very little to aid my depression.
On a side note I play and follow the classic Tetris scene and it's been wild seeing the game change in terms of age demographics in only a couple years. Went from mostly middle age 30+ to kids 14-25 at least at the top of the game.
Can we do it without fucking up the environment in the process?