On the gym floor. There are white taped blocks to indicate where you should be doing you floor exercises to keep the appropriate distance from one another.
There are signs all over the place here- on the floor, on placards, at check out registers- and yet yesterday while on line at Kohl's I watched one woman totally in her own world disregard every single one of them! (I must note though that I don't mind people's forgetfulness- the only way to really avoid this virus is to have a healthy immune system which I do, so I'm not worried!).