- This upgrade comes with Back Stretcher attachments. This set does not include the Thrival Release Board or Travel Board, one of which is required to use these attachments.
- BACK STRETCHER, YOU ARE YOUR OWN THERAPIST: The Back Stretcher puts your back into extension which releases pressure between the vertebrae of the back. This extension in addition to the Back Stretchers ability to provide deep tissue pressure due to the narrowness of the ridges releases the back unlike any other product. Furthermore, the Back Stretcher is the best product for the thoracic spine because of its ability to fit/adjust between the shoulder blades.