Ok, so we do not promise you can crack walnuts but when used properly and consistently Kegel exercisers really work.
An easy thing to do is
to insert the Kegel exerciser and to pull it out while trying to
hold on to it with your vaginal muscles. This will really give
you a good work out.
The bonus to Kegel exercise is that it prevents urinary incontinence, makes sex better and feels good.