Instructors

Mary Beth Petruska

Owner of Fusion Fitness Studio and Jazzercise Instructor

Mary Beth is a lifelong fitness enthusiast and has been a Certified Jazzercise Instructor since 2002. She has been the owner of Jazzercise on Bainbridge since 2004 and has enjoyed watching her membership grow as she reaches out to new and old Jazzercise enthusiasts, sharing this incredibly fun and effective way to exercise. As a teacher, Mary Beth focuses on giving her students a great workout by leading, motivating and inspiring. Each class fuses cardio, resistance training, Pilates, yoga, kickboxing and modern dance, and is a comprehensive workout — all in an hour. 2017 has been the beginning of a new adventure for Mary Beth and Jazzercise on Bainbridge with the opening of Fusion Fitness. We look forward to an exciting year in our fabulous new space and can’t wait to see all of you there!

Mary Beth lives on Bainbridge with her husband Mark Mitchell. They have a son who lives in Seattle and identical twin daughters in college.

Danita Morrison

Associate Jazzercise Instructor

Danita Morrison has been a Jazzercise instructor since February 2007. She first discovered Jazzercise in 2003 while living in her home state of Texas. She immediately fell in love with the program, so it wasn’t long before deciding to become a certified instructor shortly after moving to Washington state in 2006. The passion and joy Danita has for the effectiveness of the Jazzercise program is what she hopes to inspire in others while teaching. Jazzercise is her second family.

Danita lives with her husband Mike Morrison, and they have a son Wil. She is a stay-at-home mom and admittedly enjoys being a bit of a homebody, with occasional hikes and adventures to the beach with their dog, Buddy. Besides teaching Jazzercise classes Danita also home schools Wil.

Corrine Kohanek

Associate Jazzercise Instructor

Corrine started going to Jazzercise classes in 2005 and became a certified instructor by 2010. A long time fitness enthusiast, she has been a fitness instructor for various exercise programs over the past 35 years. As a Jazzercise student and instructor, Corrine has met many amazing people and has made great and long-lasting friendships. Driven by her love of dance and having fun, she works hard to make her classes fun and challenging!

Corrine is married and has two grown children. She currently lives in Port Ludlow.

Heather Hayes

Yoga Trapeze® Instructor

Heather has been a fitness instructor for 7 years and has a passion for teaching low impact classes. She attended yoga and TRX classes at her local gym in her free time. When she saw a post and video about the Yoga Trapeze® on Instagram, she knew she had to try it out for herself! Yoga Trapeze® helped relieve her constant shoulder, neck and back pain. She has also built more strength and increased her flexibility tremendously. Heather made the decision to become a certified Yoga Trapeze® instructor so that she could help others feel and experience the benefits that she had with the Yoga Trapeze.

Heather is married and has 3 children. She was born and raised in Kitsap and currently lives in Silverdale. In her free time she loves to be outdoors hiking, swimming, skiing, paddle boarding and hanging upside down from her Yoga sling!

Deanna Dewell

Pilates Instructor

Deanna Dewell received her Bachelors degree from UW, Seattle in Psychology and Music 1998, then went on to work internationally as a baboon researcher and swim school owner and teacher in Africa. She received her Bachelors in Science: Physical Therapy from WITS in Johannesburg, South Africa 2010. She then returned to the USA to live on Bainbridge Island and raise her four children in a forest home. She worked for New Motion PT on Bainbridge for almost 7 years before establishing her own practice in 2017. During this time, Deanna developed a highly successful Aqua PT rehab program which has helped hundreds of clients since 2011. Her passion for Pilates lead her to certification with world renowned BASI faculty and she finds both teaching and practicing the key to her faster triathlon times year after year.

Castoe Guzman

Castor Guzman

Boxing Instructor

Born in the Phillipines, Castor began his lifelong love affair with fitness in his 20’s. He managed a gym and began his body building career in 100 degree heat, wearing flip flops to the gym. After moving to the US in 1996, Castor began training at Bangor Naval base in Silverdale,  where he spent 10 years in the military. He started competing in body building competitions, and began honing his sport, kickboxing. Castor began teaching classes at Bangor, and then at the Bremerton YMCA. He was asked to be the lead instructor when the Haselwood YMCA in Silverdale was launched in 2011. His classes were packed, with over 300 people waiting to get in. In 2004 and 2008 he won 1st place in the Lightweight Division as well as OVERALL CHAMPION at the Mr. Fort Lewis competition. Castor recently competed at the NPC Bodybuilding Nationals after placing 1st at the WA Ironman in 2012 and 2014, and continues to compete around the NW. In 2013, Castor began training and teaching at Bainbridge Athletic Club, and continued a full schedule at the Y, as demand for his classes grew. He launched  Castor Fitness in the spring of 2019, along with his life partner and fellow instructor, Shayne Turgeon. He continues to train and teach at the Y as well, but wanted to bring more of a small group boxing and training to the island. This venue is more of a boutique boxing experience, a fusion of cardio, boxing and personal training—and a way to cultivate more one on one attention to his clients in smaller groups.