I've read people saying they got enemas on the back with their legs either pulled up, or even pulled back to their chest (and I suppose, somewhat apart so as to allow access to the anus).
Was that the case with you? Did the enema giver move the legs into position himself or herself, or did you have to move them yourself? Did you have to keep them vertical or to the chest? Would the giver hold them in position, did you keep the position yourself or did you have to hold the legs with the hands? Did you have to open the legs wide? Was the position comfortable?