What is principle behind sound vibration massage? Sound Vibration massage chair Tend uses Direct Vibration Therapy, sometimes known as Focal Vibration therapy. , Tend has a unique pin point tip to access hard to reach parts of the body. , Focal Vibration Therapy (FVT) is a type Lifepro Velocity Ball 2.0 Vibration Massage Ball Lifepro Sharper Image Battery Massage Ball at Lowes.com What do the vibrations actually do?, Vibration massage before an adjustment does exactly what your muscles need: relaxes them and stimulates blood flow to flush the wastes and bring in the