Sitzfleisch

"Sitzfleisch," or "sitting flesh," essentially refers to your rear end, butt, derriere or whatever else you chose to call the padded part of your body that you sit on. "You have Sitzfleisch!" can mean you have strong muscles down there (and can hang on when the airplane hits turbulence or the car makes a sharp turn, for example). It can, however, be somewhat less intimate and refer to your admirable patience in "sitting out" a difficult situation. Since this ladies' bench isn't experiencing any turbulence, we'll assume they're exhibiting incredible patience in waiting for their afternoon tea.