The Gyrotonic® Expansion System is a mind/body method of exercise comprised of movements that follow the natural rhythms of the body by way of weighted machines. Juliu Horvath created the method in the 1970s and based the movements on those of yoga, dance, swimming, and thai chi. The accompanying rhythmic breath helps open blocked areas of the body, creating greater joint articulation, stimulating the nervous system, and creating greater mobility, all the while, strengthening the core. Essentially, all directions of movement are explored, making it a dynamic, non-linear, and fun way of exercising.