If you're talking about the pelvic ring, or the biological zone of the pelvic itself, not sure what you're trying to ask. Exercise the muscles around the ring/zone?
if you're talking about stuffing up a cylinder/wand through the bottom area for pelvic drop and pelvic floor reinforcement, unless you have issues, not a good idea to use it.
if you're talking about stuffing up a cylinder/wand through the bottom area for pelvic drop and pelvic floor reinforcement, unless you have issues, not a good idea to use it.