The working principle of the happiness chair The high-intensity focused electromagnetic field stimulates motor neurons to control the pelvic floor muscles to perform hyper-contraction exercises, thereby activating the pelvic floor muscle tissue and promoting collagen regeneration. It can effectively enhance the pelvic floor muscles, restore firmness and elasticity; strengthen the pelvic floor muscles, and solve problems such as urinary incontinence, lower abdomen protrusion, and relaxation.