Relieve tension in your muscles with the PTP Sensory Ball. The multiple firm protrusions provide a stimulating massage experience and make it easy to keep in place while sustaining pressure. Use your body weight to apply varied levels of muscle compression and suit your personal pain threshold.The special surface of the Sensory Ball increases sensations and aims to stimulate nerve endings for enhanced relaxation. The rolling action fosters blood circulation, which may boost recovery, by bringing more oxygen, nutrients and lymphatic fluid to affected areas.SENSORY STIMULATION: Inspired by the ancient Chinese technique of acupressure, aims to stimulate the release of natural endorphins to relax the nervous system.