something a bit like Pilates right?, lots of slow but heavy resistance and stretching

in Systema there is a heap of more "dude" style exercises that are also quite slow and heavy, stuff like one hand pushups and such

i'm sure there's more to it though of course, but when i think of yin i think of opening up the things that are closed and closing up the things that are normally open, sorta like undoing a lot of the yang that we do in our day