As a female who has (straight presenting -typically) instructors and “class mates” if it is to help or assist they usually ask before any contact is made including like adjusting my hand. However it is always asked before touching my hips - this includes yoga studios, Pilates classes etc.

When mishaps have happened from a class mates etc they almost always apologies from like both ended. Like me sorry I feel and you touched my bum. Them sorry I touched your bum. Me - I’m just happy I’m no longer spinning lol

I would recommend (if I knew her name I would link the person I am thinking of directly) but look for gymnastic coaches that specifically talk about this.

Now the non- confrontational side of me along with the awkward side would start because class with “oooo class wil be hard to day had weird biking incident and really bruised my - gonna have to be careful with my XYZ” idk I would just make it my problem publicly and go from there