For yoga avoid any postures that increase symptoms, find the ones that you can do.
Swimming ? or more of floating in a warm pool or hot tub helps many.
Speed walking -moderate?
during my acute recovery time PT had me start w/ isometrics.

But sometimes it is best to back off most strenuous activities until you get pain/symptoms under control.

I'm experimenting with a mini trampoline for overall fitness & lymph drainage help. No vigorous bouncing , just an easy up/down or side to side movement -not even lifting off the tramp.
but i need to be more consistent with it to see if it makes any difference.