Life has been kicking my butt lately for reasons unclear to me --it's spring! why the depression symptoms now??

It seems like a bunch of people (me included) made it through winter then crashed in the spring -- no idea WTF's up with that, but you are not alone.

I've been just maintaining a minimum of running, yoga, and a little bodyweight strength training

That's a pretty nice minimum to maintain -- go you! And the "fitness stations" could be fun to play with.