A lacrosse ball is a simple and convenient tool that allows you to massage «trigger points», or areas of tight tissue, that are causing you pain. (tomcoffeyfitness.com)
Tight calves can have a direct relationship and effect on tight tissues of the feet; tight calves usually go hand and hand with tight feet. (weckmethod.com)
It's not so much for releasing tight tissue but increasing the viscosity, or water, in the tissue. (onnit.com)