GROUP CLASSES
Starting the first week of February!
Group Classes are open to active Custom Fit training clients and gym members. See “eligible memberships” below for more information.
If you are not currently training with Custom Fit, get started with our New Client Special or sign up for a Gym Membership!
How Do I Join Group Classes?
If you are currently training with us:
Login to the Custom Fit Gym app
Click “Book Classes” on the homepage
Select the class(es) you would like to attend
Show up and check in with the instructor!
If you are NOT currently training with Custom Fit:
Download our gym app for the easiest booking experience:
Upon opening the app, click “Join Club”
Complete your profile and select an eligible membership*
Once the membership is on your account, book your class and you’re all set
Show up and check in with the instructor!
Eligible Memberships:
Personal Training or Partner Training (min. of 1x per week)
Monthly or Annual Gym Memberships
2x-Drop-in or 10x Drop-in packs.
If you have any questions, don’t hesitate to email, text or give us a call!
Class Descriptions
Posture, Mobility, & Stability with Melissa Yu
Are you tired of living with persistent pain in your neck, shoulders, or lower back? In this class, you will learn different techniques in how to correct forward head posture, rounded shoulders, slouched or hunched backs, etc. Learn how to mobilize and stabilize different joints in your body along with different exercises to strengthen core, glutes, and hamstrings to support better rib cage and pelvic alignment. Let’s improve your posture, alleviate pain, and reclaim your life today!
Bars and Bells with Isaac Kolberg
Bars and Bells brings together barbells, kettlebells, and dumbbells in a dynamic group class designed to build strength, improve conditioning, and elevate overall fitness. With a focus on functional bodybuilding, this class is tailored to enhance athletic performance and support total well-being. Each session is carefully programmed to meet you where you are, helping you push your limits safely while maximizing muscle growth and metabolic health. Expect a strategic, results-driven workout that challenges and empowers you.
Kettlebell Fundamentals with Pete
Kettlebell Fundamentals is all about mastering the essentials of hardstyle kettlebell training in a step-by-step approach. Each session focuses on perfecting foundational movements, starting with RDLs, goblet squats, and bracing, before progressing to advanced techniques such as swings, presses, and Turkish Get Ups. With movement mechanics as the priority, this class ensures you build strength, control, and confidence with every step. Whether you’re new to kettlebells or refining your skills, this workout balances technique and intensity for lasting results.
The Control Room with Leo
Take control of your strength and movement in The Control Room, a dynamic circuit-style class designed to keep you moving and challenged. With controlled tempo work at its core, this class focuses on building strength, stability, and endurance without the need for shared equipment. Perfect for all fitness levels, The Control Room ensures a seamless flow as you work through thoughtfully designed stations that target every muscle group.
Yoga Power Flow + Beats with Colin
Elevate your practice with a power morning flow that blends fluid movement with focused strength-building poses. This class combines dynamic vinyasa flows with strength-building poses, core work, and powerful movements designed to build endurance and stability. Move with purpose, hold with intention, and let the music drive your flow as you cultivate strength and balance.
About The Trainers
Melissa Yu, CMT. CSCS
I graduated from UC Davis in 2014 with a degree in Exercise Biology. I then attended San Francisco School of Massage in 2017 to receive my massage license. Throughout the years, I have worked with a variety of population, including corporate tech workers, doctors, lawyers, weekend warriors, runners, professional/amateur boxers, MMA fighters, professional football players, etc. I am a certified massage therapist and a certified NSCA strength and conditioning specialist specializing in helping people build strength, improve mobility, and overcome injury. I combine both soft tissue mobilization and corrective exercises to help my clients move better. I believe that making each routine functional for clients is key and will help them remain successful in life, no matter what their goals are. I am always finding new ways to better myself and I will easily shift techniques depending on clients’ goals and needs. During my free time I love to box, watch sports, and take high energy group classes around the city. My education, knowledge and experience aid in the evaluation and treatment of my clients.
Certifications/Education
UC Davis - B.A. Exercise Biology
NSCA Certified Strength and Conditioning Specialist (CSCS)
CAMTC Certified Massage Therapist- San Francisco School of Massage
National Personal Training Institute (NPTI)
NASM Certified Personal Trainer (CPT)
Functional Range Conditioning (FRC)
Functional Range Assessment (FRA)
Functional Range Strength Coach (FRSC)
StickMobility Level 2
DBC Level 1
Functional Movement System (FMS)
SportStretch® certified
Rocktape FMT- Myofascial Cupping Practitioner
Instrument Assisted Soft Tissue Mobilization (IASTM)
Myofascial Decompression- Cupping Therapy Level 2
NASM Corrective Exercise Specialist (CES)
KILO Advanced Strategies to Program Design/Applied Exercise Technique
Dynamic Neuromuscular Stabilization (DNS) Exercise pt1
Isaac Kolberg
Director of Assisted Stretching
Whether you are chasing a dream physique, fluid movement, or the foundation to crush any workout, I'm here to help you get there.
I specialize in functional bodybuilding, sculpting not just aesthetics, but the power and agility of a true athlete. We'll build lean muscle mass through movements that mimic real-world function, leaving you strong and ready to tackle anything life throws your way.
As an ISSA-certified personal trainer and pain-free performance + hip specialist, I prioritize mobility and corrective exercises. My toolbox includes assisted stretching and targeted techniques to unlock your full potential, pain-free. My in-depth understanding of the connection between hip health and overall performance will guide you to long lasting range of motion.
Certifications and Education
International Sports Science Association (ISSA) - Certified Personal Trainer
International Sports Science Association (ISSA) - Hip Specialist
Pain-free Performance Specialist Certified (PPSC)
Functional Movement Training (FMT) - Rock Tape Cupping Certified
Peter Fonteneau
Personal Trainer / DEXA Technician
I started my fitness journey like many other 15 year old kids growing up in San Diego - I signed up for the local gym to get some muscle for the beach! What I didn’t realize when I walked through the doors that day was that I had found something that would ignite a lifelong passion. In 2008 I moved to the bay area to attend Sonoma State University where I would go on to get my bachelors degree in Kinesiology to begin a lifelong pursuit of health, fitness and movement.
In my 10 years as a trainer I have a diverse background of experiences: training in gyms, running large and small groups (indoors and out), rehab clinics, athletic training development, corporate fitness and kettlebell specialization. This wide array of experiences has helped to build a foundation of knowledge and confidence to be able to help anyone achieve any goal they wish to attain
My approach as a trainer is to teach movement, and fundamentally change behaviors. I don’t believe in a one size fits all approach - there are many different paths that lead to success and I am committed to finding the one that will best suit your lifestyle while leading to your goals, so that we can make changes that will last long term. Whatever the path we take, we’ll be sure to improve strength, correct movement patterns and postures, and have fun along the way!
I take a data-driven approach, through testing and tracking, as a way of constant feedback so that we can make sure you are maximizing the results from your hard work. My ultimate driver is to teach and instill a lifelong movement practice with everyone I work with.
Certifications & Education
Sonoma State University - Bachelors of Kinesiology
University of California San Diego - Certified Bone Densitometry Technologist (CBDT)
Leo Kaiser
Personal Trainer / Sales Manager
Hi, I’m Leo Kaiser, your personal trainer at Custom Fit. I specialize in lean muscle building, longevity, mobility, flexibility, fat loss, and making fitness fun through gamification. At Custom Fit, I tailor each workout to your unique goals, ensuring you get the most effective and efficient training. My focus is on creating lasting habits for lifelong health, blending strength training, cardio, and flexibility work. I believe fitness should be enjoyable, so I turn workouts into engaging activities to keep you motivated. As your coach and partner, I'm committed to your success and overcoming any obstacles together. Join me at Custom Fit, and let's make your journey to a healthier, fitter, and happier you a reality.