You can still have chemistry on screen without getting on with the person. But it just makes your job a lot easier if you don't have to gird your loins, if that's not quite the right phrase, every time you're going to do a scene with that person.
Francis Webb is easily our greatest poet and one of the greatest poets in the world but he's hardly ever mentioned.
I pride myself in taking care of my mind, body and soul, and not just through exercise.