Staff | Personal Trainer | Training Gym

ZenRock’s staff has been carefully selected to represent the very best in their respective fields. Our professional certified trainers are guided by a steadfast belief that one-on-one training in a private studio – devoid of distractions – is the optimal way to achieve significant, long-lasting results. We encourage you to learn more about each of our trainers by clicking on their photos below.

PETRA JAHN
Owner, Trainer & Yogi

NOVA GUTHRIE
General Manager, Retreat Coordinator, & Personal Trainer
BELLEVUE & REDMOND

BRITT MCWILLIAMS
Assistant Manager & Personal Trainer
REDMOND

Britt McWilliams: Assistant Manager, Redmond & Personal Trainer

Born and raised in Redmond, WA, I have been involved with the fitness industry since 2012. After giving birth to 2 boys and sitting behind a desk for 7 years doing Medical Billing, I strived for a more active lifestyle. I became obsessed with Group Fitness. I hold a AFAA Level 3 Group Fitness certification and was at one time teaching up to 16 classes a week. These were of various high-energy formats including Zumba, R.I.P.P.E.D., BODYSHRED, Bootcamps, as well as a young child’s music and movement class called Zumbini.

Striving for continuing education and having a strong desire to learn, I shifted my focus to nutrition in 2014. Immediately I noticed a giant lack of coaching and positive support systems for the average individual looking to make smart choices. So I took the love, happiness and high energy aspect of my experience with Group Fitness and combined with the true science based facts of nutrition. Using real food to reset the metabolism, but catering this theory to adapt to the specific client, rather then using cookie-cutter methods. My biggest goal is to show every client I encounter that “eating clean” and being “healthy” doesn’t need to be overwhelming or scary. In fact, it should be fun! I strive to not only provide unconditional support but educate throughout the entire process so that clients can be in charge of their own lives. And that they eventually feel confident to continue making positive choices permanently.Striving for continuing education and having a strong desire to grow, I branched out my certifications to include Personal Training, Nutrition, and an endless list of specialty courses. In 2016, I became a Master Trainer for Jillian Michaels teaching other instructors the BODYSHRED format in Washington, Oregon, and Idaho. I truly believe I have found my life’s calling by being a Coach and Personal Trainer.

When is comes to our bodies, I believe in biomechanics above all else. Whether you are just starting your journey, are an experienced athlete, or recovering from an injury, we will always utilize proven science to establish and define reaching your desired outcome.

My biggest goal is to show every client I encounter that your physical health and exercise shouldn’t be scary. In fact, it should be fun! I strive to not only provide unconditional support but to educate throughout the entire process so that clients can be in charge of their own lives. I want everyone to eventually feel confident to continue making positive choices permanently.

Working with me, clients can expect an experience catered to them, their needs, and their immediate goals. Whether it be with training or lifestyle guidance, the coaching support is always unconditional and non-judgmental.