The art of tumbling, balancing, and jumping presented as performance, often with the use of such apparatus as poles, unicycles, tightropes, trampolines, and trapezes, and typically performed at fairgrounds, circuses, and theaters. For the competitive sport involving physical exercises of strength, agility, and balance, use "gymnastics."

Source: & Architecture Thesaurus 

http://vocab.getty.edu/page/aat/300263162