Reading what you’ve written, I can see it! 
The word “gymnastics” gave me flashbacks to wearing an awful little leotard and having to balance on a balance beam lol, which really threw me off- I think “Slavic yoga” gives a much better picture of the practice, at least in my mind. Thank you for this, Katerina (and wow- your Polish is on point! 
)
Do it! 
(and please let me know what you think if you give them a try! 
)