A yoga block system which includes a first block and a second block which can either be rectangularly shaped or triangularly shaped. These blocks are capable of joining with one another, releaseably, along either a common face when the blocks are rectangular or along the hypotenuses when the blocks are triangularly shaped. At least one of these blocks is preferably hollow enabling a user to gain access to its interior. Notwithstanding the elements used to join them, each block presents to a user faces which remain substantially planar.