Kelvin Miyahira Kelvin Miyahira has worked with several collegiate strength coaches and athletes at the University of Hawaii, University of Louisville, University of Nebraska, HPU, and Mt. San Antonio College. He has trained 100's of athletes, including Olympic hopefuls, from as young as 6 years old to adults in all sports from baseball, golf, soccer, tennis, volleyball, track, etc. Kelvin has products being used by the David Leadbetter Junior Golf Academy in Florida as well as many other golf academies across the US. and in Mexico/South America. Many LDA members including Scott Smith, holder of the Guinness World Long Drive Record with a drive of 539 yards uses his methods and products.