Rope arts in my opinion is where weight support is different. For normal poses, most likely the weight support is from your feet, your knees, your belly, your butt or your back, etc. Then model uses other parts of the his/her body, such as, waist, limbs etc to create a beautiful pose.
@rynnpevy demonstrated how to use her weight support from her chest to pose very differently which aerialist does that all the time.
It is beautiful!