Trigger Point Tools and Books
If you work with trigger points in your massage or other healthcare practice, a trigger point tool can both save your thumbs and provide deeper pressure to the client.
What's a trigger point? If you apply pressure to a point on your body and you feel pain or sensation someplace else, you have discovered a trigger point. Trigger points refer pain, weakness, or numbness to either nearby or distant muscle tissue.
The definitive reference for this work is Travell & Simons' Myofascial Pain and Dysfunction: The Trigger Point Manual.