Since 1990

We welcome you to become part of our team, North Marin's oldest, most successful and fun Masters Swim Team. We are a registered national US Masters Swimming team which is part of the Pacific Masters regional organization.

For over 25 years we have been dedicated to helping each fitness and competitive swimmer improve skills and achieve their goals through challenging workouts and the latest technique enhancements. All with the support of your teammates and under the guidance of our award-winning founder and Head Coach, Sharlene van Boer.

Our year-round U.S. Masters program is for those adults who love to swim, either for fitness or competition. The workouts are usually 2500-3000 yards and feature stroke technique and conditioning sessions, all aimed at helping you become a better swimmer and to enjoy the sport even more!

Why are we successful and fun?

First of all, we are a true team and enjoy each other's company, in and out of the water. In addition, we have members who have been with the team since its founding, and a large core group of fitness swimmers and competitive swimmers. The Mud Sharks have set age-group World Records, Pacific Masters records, National Top Ten times and top team finishes at regional swim meets.

Plus, our Head Coach and Founder, Sharlene van Boer, has received the Coach of the Year Award for the Pacific Masters Region.

If you would like to give us a try, we welcome you to give us a call or email us and attend a complimentary practice or two.

Please feel free to contact either:

Head Coach - Sharlene van Boer 415-892-9087, or

President - Eric Sutton-Beattie 415-320-2559

We're also on FaceBook:

Our Workout Schedule

  • Morning Practices Mon-Wed-Fri, 10:00 am to 11:15 am
  • Weekend Saturday, 8:00 am to 9:15 am
  • Evening Practices Monday, Wednesday, 6:30 pm to 7:30 pm

See you at the pool!