Wheels

A yoga wheel is a circular shaped prop that helps open the front side body, assists in advanced yoga postures, and rolls out the spine. Basically – it's the bomb. The Why: ... The wheel helps yoga practitioners move deeper into postures, specifically heart opening postures like backbends and forearm balances. 

The yoga wheel is a hollow, circular shaped prop designed for aiding stretching, releasing tension and improving flexibility.  The yoga wheel is one of the best tools on the market by far.