Mine was my zumba class. Normally held in a lovely room with a stage. This week, moved to a different room.
With a
Full
Length
Wall
Mirror.
I look fine (but only fine) standing straight wearing my work dresses etc. Bigger than I like, but I know I've put on weight since being poorly last year.
But watching myself doing the zumba class in the mirror from all sorts of flattering angles was not a joy.
But it has proved motivating.