Ritter Sports Performance

David Tambuwun started coaching in 1994 at the Redlands YMCA, where he managed to produce top Masters Swimming champions in California and a National Top-10 Masters Swimming swimmer. In 1996, David worked as a Water Safety Instructor Supervisor for the City of Rialto where he trained Water Safety Instructors and helped develop the structure of their Learn-to-Swim program. During that time he also coached part-time at Streamline Aquatics of Rialto (STAR) as one of their age group coaches. This position eventually led to a Head Age Group Coaching position in 1998 where he produced Southern California top-16 age group athletes and a national record holder for disabled swimmers who went on to attain multiple gold, silver, and bronze medals at the 2004 Athens, 2008 Beijing, and 2012 London Paralympic Games collectively. After leaving the City of Rialto Parks and Recreation in 1999, and while still the Head Age Group Coach for STAR, David took over a Head Coaching position for Inland Masters Swimming Club (Rialto B