In fact, walnuts can achieve good fitness purposes! If you buy it, you'd better not buy that kind of stone. Those stones will foam and be very dirty. This stone looks beautiful on the surface, but it's useless! Stainless steel should be good and heavy, of course, the real thing is still a little more expensive. For the younger generation, Hua 180 yuan really expressed his filial piety by buying a good fitness ball for the elderly.