Easiest way to correct: Whenever you think of it, just imagine a string from the top of your head, pulling your spine straight. Get your shoulders to fall in right, the rest will follow. Second easiest way: Cardio. Dunno why, just doing cardio makes you carry yourself straighter. Maybe it's just rearranging your chest so you can breathe?
To be fair, this only works if you don't have huge tits. If you've got them, you're *always* going to be slouched so you can see what the hell you're doing.
But it's weird because showing it once can actually decrease the amount of complains, showing two genders will trigger some non-binary people (Not me though)
And if you're red green cb the ones on the left