Rejuvenation through vibration is the mantra of the Health Mark Vibra Back Wave Generation II Vibration Trainer. Combine natural traction and movement with vibration stimulation to create the world's most innovative exercise therapy. This machine is meant to increase muscle strength and tone, while improving your overall health. Studies show that it can reduce back and neck pain, improve circulation, and adjust spinal misalignment. Simply vary the speed and positioning while using the trainer to experience improved posture and increased range of motion. Great for those who need to open the hips and rib cage.