The Ultimate Sports Association (USA) is a non profit 501C3 which manages the John Muir Health Ultimate Fieldhouse, in Walnut Creek and is dedicated to youth development, healthy living and social responsibility. Is it our mission to provide our community with programming that allows us to develop our youth to their full potential, socially, physically and mentally as well as a safe and secure environment to execute that programming in. USA manages and operates the John Muir Health Ultimate Fieldhouse including oversight of all programming within it.