Image cropped from https://yurielkaim.com/7-fat-burning-leg-exercises/
I am making a sentence presenting the image in picture. I want to say that one shouldn't sit the way that the knees are wide open. Does this construction suits best? Note the bottom of the man should be resting on the floor, it's not in the image though. Actually I couldn't find one. I just want to present the position of the knees.
You should not sit in a way that knees remain open.