Parinama is transformation not only of the mind, but also of the body, elements and senses. Parinama is also the cause of creation of the universe, which is still in constant parinama, or change. It always exists in prakriti (matter) that is constantly changing because of its three qualities of creation, preservation and destruction.
Parinama is the essential idea behind the Samkhya and Vedanta philosophies. Both Samkhya and yoga schools of Hinduism believe that everything is a projection of something that has already been present or hidden. That is also why these schools of thought believe that the world has materialized out of the world that existed in a hidden way before. This is called the "Parinama Vada," the transformation theory, established in yoga and Samkhya philosophies.
This theory applies to yoga practice itself. It is believed that all results and progress are a transformation of something that was already hidden and unseen deep inside.