Excellent for Thoracic Spine Mobility and anybody dealing with big pain or muscle issues in the back after strenuous exercise would benefit from this. I just wonder what makes this cost 24 EUR - it is just a little bit of plastic. You can achieve the same benefit by buying two rubber balls for dogs for 2-3 EUR each and putting them in old sock.
Otherwise the idea and the Functionality of this little helper is beyond question.
