To me, the rings as a training device represent the most brutal and complete way to train your body. There is no single muscle group, joint, tendon or bone, which is not affected during training on the rings. I started rings training in the late 2011, mostly affected by Yordan Yovtchev. I always kinda liked gymnastics, despite never trained it, and the rings seemed to be the only apparatus, which I though would work, since I am not that coordination-wise gifted. It turned out that the rings are the most brutal apparatus, but my love there kept growing. Nowadays, I carry my rings everywhere and anytime!