Increases circulations and reduces muscle tightness
RockBalls are a great way to perform self myofascial release with pinpoint accuracy.
They are sold as a pair and feature a large spikey ball, a small smooth ball and an instruction book with release trigger points and mobility exercises.
Two is definitely better than one. The 3.5" textured ball and the 2.5" smooth ball give you two tools to break through tough tissues.
Conveniently portable, includes a how-to guide