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Dear Teen Athlete Families,

We’re excited to share that we’re considering launching a new athletic performance training program for our teen athletes, and we’d love to know if your child would be interested before we finalize the details.

What the program covers

Our approach

The program is structured in 8-week cycles designed to build strong, resilient, and powerful athletes step by step:

  1. Foundation phase — building strength and muscle (hypertrophy) as a base.
  2. Progressive overload phase — gradually increasing intensity and complexity.
  3. Ligament loading phase — strengthening connective tissue for durability.

This gradual, phased approach ensures athletes adapt safely while developing the movement quality, strength, and power that carry over directly to their sport.

The proposed schedule would be Mondays and Thursdays at 6pm and we want to gauge interest from families. If your child would be interested in participating, please reply to me as soon as possible.

Feel free to reach out to [email protected] with any questions

Thank you for your continued support!

TJ

GETTING STARTED IS EASY!

Simply fill out the form below and then schedule Your FREE intro session on the next page.

Shortly after we will be in touch with you to confirm your intro session. We are excited to meet you!

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Troy Sack

COACH

Troy Sack is a Petaluma native who grew up in the area before building a career coaching athletes across Marin and Sonoma County. His path to coaching began in powerlifting, where he built a foundation in strength fundamentals and technical barbell work. From there, his focus expanded into athlete development, working with youth and competitive athletes to help them perform at a higher level. Today, he works with both competitive athletes chasing performance goals and everyday people simply looking to get stronger, move better, and reach their own fitness goals.

He holds his NASM Certified Personal Trainer credential and is a CrossFit Level 1 Coach. His approach is straightforward: build a solid foundation, stay consistent, and keep progressing.

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Pedro “Hawk” Morales

COACH

Hawk grew on the Mendocino Coast and moved to Marin County in 2023. He has always had a passion for individual and team sports having grown up competing in wrestling throughout Middle School and High High School and Competitive Cheerleading in High School where he was a 4 time National Qualifier through USA Cheer and was a UCA All Star his senior year, having helped coach his squad to a fifth consecutive USA Nationals the year after graduating.

He has always relied on fitness as a standard in his life, but after years of events and hospitality work in wine and fine dining, decided to transition into the fitness world as a career in 2023. He became certified as a personal trainer through the National Association of Sports Medicine and is currently working on continuing his education in Nutrition and Corrective Exercise. He has been a part of TJ’s Gym since 2024 where he has continued to refine his technical lifts and has had experience in coaching teen clients, personal training clients, and large group format classes. He also specializes in HIIT and has a passion for body recomposition, functional bodybuilding, and mobility training.

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Zulma Terrones

COACH

Zulma is a strength and wellness coach with over a decade of experience at the intersection of physical and mental health. Her coaching is rooted in evidence-based movement, resilience-building, and mindful strength—helping people build not just stronger bodies, but stronger relationships with themselves.

After years working internationally as a mental health crisis clinician, Zulma turned to strength training as an empowering embodiment practice and stress management technique. She helps clients understand that strength and mobility are powerful tools for transformation and longevity, cultivating consistency, patience, and self-trust that extend far beyond the gym.

A former rower and dragon boat athlete, Zulma brings a diverse movement background, with experience in yoga, running, cycling, TRX, and reformer Pilates. In her sessions, she prioritizes functional strength, fluid mobility, and long-term growth, creating a supportive environment where people lift safely, build resilience, and feel genuinely encouraged.

ISSA – Level 4 Trainer, Cambridge Mindfulness Meditation Certified, Psychology & Education, MPhil

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John Main

COACH

John is a strength and conditioning coach with more than 20 years of experience helping athletes, first responders, and everyday people move better, grow stronger, and stay active for life. Along the way, he’s founded and led gyms, built coaching systems for national fitness organizations, and taught seminars around the world as a senior instructor. From working with high-level athletes to creating adaptive programs for wounded service members, John brings a thoughtful, practical approach to training that meets people where they are and helps them feel capable. His work centers on long-term health, quality movement, and building real-world strength—so people can keep doing what they love, inside and outside the gym.

John is a Certified CrossFit Coach (CF-L4), Active Life Professional, POSE Running Technique and Training Specialist, The Brand X Method Certified Professional Youth Coach, USA Weightlifting Sports Performance Coach, and National Academy of Sports Medicine Certified Personal Trainer.

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Bryce Monroe

COACH

Bryce Monroe is a San Francisco native and former Division I basketball player. After graduating from Archbishop Riordan High School, he earned a scholarship to Sam Houston State University, where he was named Freshman of the Year, and later completed his collegiate career at Indiana University.

Bryce graduated in 2024 with degrees in Business and Health Education and is currently working toward his Master’s in Entrepreneurship and Finance. He’s passionate about injury prevention, training safely, and helping people build real strength, power, and confidence—all while having a good time along the way.

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SAMANTHA PINNEY

COACH

Born in NY and raised in NJ, Samantha arrived at TJ’s with a far-flung sports resume skiing, mountain biking, cycling, outrigger canoeing, triathlons, trail running, surfing, stand up paddle boarding, weightlifting, and CrossFit.

Guided by the teachers and coaches along the way, Samantha built a working knowledge of training fundamentals, nutrition, programming, zones, and proper movement. Paired with her drive to make every gym class the best hour of the day, she loves leaning into what makes each member unique to help them reach their goals or at least make them feel better about getting up so early to come to the gym.

When she’s not moving around, you’ll probably find Samantha drinking a hazy IPA, reading a book, bingeing a show, or stuck in traffic on I-80.
 
Samantha has a CrossFit Level 2 Certification. 
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TATUM ROBACH

COACH

Tatum’s journey with TJ’s Gym began long before she became a coach. Having trained there throughout her high school years, she developed a deep appreciation for disciplined training, performance, and the long-term impact of quality coaching. She went on to graduate from UC Davis in 2020 and has since dedicated her career to helping others build strength, confidence, and resilience through purposeful training.

As a NASM Certified Personal Trainer with a Performance Enhancement Specialization, Tatum is passionate about working with athletes and individuals of all ages who want to elevate their performance and reach meaningful fitness goals. With a background in competitive soccer and basketball, she understands the demands of sport and the importance of strength, speed, endurance, and injury prevention in long-term athletic development.

Outside of the gym, you can find Tatum biking, running, playing with her dog, or exploring new restaurants. She believes that staying active should enhance your life beyond the gym, helping you feel strong, capable, and ready for whatever you enjoy most.
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DANA SCHUMAN

COACH

A long-time TJ’s member, Dana took some time over the past few years to dive into training and earn various certifications, including a CrossFit Level 2 certification. In another life, Dana won two NCAA Division One titles as a member of the Penn State gymnastics team.

Dana has a Master’s degree in chemistry and an undergraduate degree in Kinesiology, so she gets the science behind what fitness! Mom of two boys and wife of TJ’s San Rafael staple, Dave, Dana is committed to her craft and is thrilled to be coaching at TJ’s giving back to a community that has given her and her family so much.

2x all American NCAA Division 1 CrossFit Level 2 certification CrossFit Mobility certification ACSM (American College of Sports Medicine) personal trainer ACE (American Council on Exercise) group fitness instructor Certified in Kinesiology Taping and RockTape FMT1 (Fascial Movement Taping Level 1)

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NICK LAPLANT

HEAD COACH AND PROGRAMMER

Nick grew up in Marin County and attended Tamalpais High School. He moved on to Humboldt State University, where he graduated with a B.S. in Kinesiology with an emphasis in Exercise Science. Nick earned a collegiate scholarship, competing in Cross Country and Track and Field (800m,1500m & steeple chase). During his senior year, he completed an internship at TJ’s Gym to earn hours for his undergraduate degree and was immediately drawn to the functional fitness program TJ’s Gym. Nick was especially intrigued by the mix of endurance training and strength development included in our approach and recognized that part of what makes it works so well is the strong community supporting positive life-changing habits–both in and out of the gym. A student of various other strength-training methodologies who is passionate about his ongoing learning and development of expertise, Nick is a sought-after asset to the TJ’s coaching staff. He is known for his exceptional attention to individual members’ needs, especially as they get started with a new exercise and lifestyle program. He is our Head Coach, programmer and also runs our Running Strong program.

In addition to coaching, Nick programs the workouts for all classes at TJ’s Gym and also works with clients via our Individual Design program. He is meticulous about the process of designing workouts for groups and individuals, alike.

Nick holds a Health Fitness Specialist Certification from the American College of Sports Medicine. *CrossFit Level One

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GETTING STARTED IS EASY!

Simply fill out the form below and then schedule Your FREE intro session on the next page.

Shortly after we will be in touch with you to confirm your intro session. We are excited to meet you!

(give our form below a second to load, we love you for it!)

TJ Belger

Founder/Owner

TJ hails from New Jersey. Those who know him best would say that the Jersey in him makes for some of the most appealing aspects of his character, including a powerhouse work ethic and an ability to relate effortlessly to people from all walks of life. A lifelong athlete who took time to grow into his large physical frame and excel at sports, TJ has always had a foot in the fitness realm. After college, he taught PE at a school in his hometown. While he liked the job, he decided there was more to explore; he moved west, landing in Marin County in 1992. After many years as a personal trainer, TJ opened his own gym in San Rafael in 2002, shortly before the birth of his first daughter. At that time, it was a place where he and other personal trainers could work with clients without the hassles of larger, less personal facilities.

While TJ loved his work as a personal trainer, by 2007 he found himself itching to expand his knowledge and recharge his training batteries. This happened when he found CrossFit, an exercise program involving functional body movements executed at high intensity and with great variety. TJ credits CrossFit for introducing him to a new way of thinking about fitness, and he still incorporates many elements of the methodology with his own clients and the thousands of Marin County people he has welcomed into the gyms over the years, creating his own brand of fitness and community.

Like that of many small business owners, TJ’s success can be attributed to a number of factors. However, those closest to him emphasize the same interpersonal qualities that allowed him to retain his first clients over 30 years ago. Although TJ holds certifications in various aspects of fitness training, he finds that it is his independent learning that has been most applicable to the success of his gyms. A driven researcher, TJ’s goal is to constantly delve into smart science behind fitness, health, medicine, nutrition, psychology, in order to adapt and innovate for the benefit of his members. His passion is helping people set goals, stay accountable, and lead better lives. He meets individually with everyone who walks through the doors of the gyms, a practice reflecting his deep desire to connect with each of his members and help them succeed in their fitness and lifestyle goals.

TJ feels fortunate to mentor and work with other fitness professionals who love their jobs and bring their own personalities and interests to his gym. He is most proud of the amazing community of people he and Allison have been fortunate enough to bring together at TJ’s Gym. While life is sometimes stressful and always very busy, TJ is inspired by the athletes in his classes, his personal coaching clients, and the daily opportunities he has to help people live longer, more fulfilling lives.

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ARE YOU LOOKING TO DROP-IN?

We Would Love To Meet You!
WARNING! Class Sizes Are Limited.

If you would like to reserve a spot… Simply fill out the form below letting us know what day you might come by & one of our amazing coaches will reach out to you to reserve your class.

OUR DROP-IN RATES

$40 Per Class

FIND US AT
118 Corte Madera Ave,
Corte Madera, California 94925

(415) -215-1253

OUR PRICING IS SIMPLE

We Want To Offer You The PERFECT Membership For YouR NEEDS.

Simply fill out the form below and one of our amazing coaches will send you our current membership information.