MEET OUR COACHES

Stephanie Walti

IFBB Pro (Bikini Division)
NASM Certified Personal Trainer
NASM Certified Sports Nutrition Coach
NASM Weight-Loss Specialist

Stephanie Walti’s love for movement began in childhood as a competitive gymnast. It was there that she first discovered the joy of pushing her body and mastering new skills.

At 25, she found her way into bodybuilding and quickly fell in love with the process, getting stronger in the gym, setting goals, and watching her body transform. What started as a physical pursuit soon became a life-changing journey. Once a shy and insecure kid, Stephanie credits bodybuilding with giving her a deep, unshakable confidence and a clear sense of purpose.

Stephanie first stepped on stage in 2017, returning to competition in 2021 and 2023, when she won the Bikini Overall at the Muscle Contest Southern California Championships. She earned her IFBB Pro Card at her first national show, NPC Universe, and placed Top 5 in her Pro Debut at Ben Weider’s Naturals. Since then, she has continued to compete on the professional stage, gaining valuable experience and continuing to evolve as both an athlete and a coach. She thrives on the challenge of contest prep and is deeply committed to competing as a natural athlete, leading by example and showing women what’s possible through consistency, discipline, and dedication.

As a personal trainer and founder of Built For This, Stephanie is passionate about helping women of all ages and stages build strength, develop sustainable habits, and cultivate confidence that extends far beyond the gym. Her coaching philosophy centers on education, individualized programming, and accountability, empowering clients to understand their bodies, take ownership of their progress, and build a lifestyle that supports their long-term health and goals. For Stephanie, fitness is about more than changing how you look. It’s about discovering what you’re capable of, becoming stronger from the inside out, and building a life that reflects the person you want to become. There is nothing more rewarding to her than helping women recognize their potential and watching them step into their power.

Marili Rivera

Currently pursuing a NASM Personal Trainer certification
Accepting clients in January 2027!

Marili Rivera is a fitness coach with a passion for helping women build strength, confidence, and sustainable habits that fit into real life. As a respiratory therapist in a trauma hospital, a mother of two daughters, and a student of psychology, Marili understands the challenges of balancing personal goals with demanding schedules, family responsibilities, and the unexpected obstacles life can bring. Her own fitness journey has taught her that progress doesn’t require perfection, just a willingness to keep showing up.

Marili’s athletic background began with endurance running, during which she completed five full marathons and approximately 40 half marathons over four to five years. Her focus has since shifted toward strength training and building muscle, where she continues to challenge herself and develop her physical capabilities. Through her experiences navigating motherhood, long hospital shifts, stress, and physical challenges, she has learned the importance of adaptability, consistency, and finding ways to prioritize yourself even during life’s busiest seasons.

Marili believes fitness is about far more than changing your appearance. It’s about building discipline, improving confidence, and discovering what you’re capable of, both inside and outside the gym. Her coaching philosophy centers on meeting clients where they are, providing honest accountability, and creating realistic strategies that support long-term success. She strives to make every client feel seen, supported, and challenged without the pressure to be perfect.

As a Built For This coach, Marili is especially passionate about helping women who feel overwhelmed, intimidated by fitness, or ready to reconnect with themselves. Her goal is to help clients become stronger physically and mentally while developing the knowledge, confidence, and independence to sustain their progress long after their coaching journey ends.

Shelby Beltran

Currently pursuing a NASM Personal Trainer certification
Accepting clients in January 2027!

Shelby Beltran is a fitness coach with a diverse athletic background and a passion for helping others build healthier, more sustainable lifestyles. With approximately 13 years of competitive gymnastics experience, followed by all-star and high school cheerleading and three years of collegiate cheerleading at California Baptist University, Shelby developed a strong foundation in discipline, dedication, and athletic performance. Her passion for fitness eventually expanded into weightlifting and CrossFit, where she competed and later gained experience as a coach.

Shelby brings approximately seven years of competitive gymnastics coaching, three years of CrossFit coaching, and three years of personal training experience, both in person and online. While she was introduced to weightlifting in high school, her journey into bodybuilding began in earnest around 2022, leading to her first bodybuilding competition in May 2025. Through bodybuilding, she has developed a deeper appreciation for the importance of nutrition, supplementation, sleep, and recovery, recognizing that achieving results requires more than simply working hard in the gym.

As a coach, Shelby is passionate about helping individuals achieve their goals while building habits and skills that last beyond a short-term transformation. She believes fitness is about more than physical results. It is an opportunity to develop confidence, discipline, consistency, and a stronger belief in yourself. Her approach emphasizes individualized training, realistic expectations, accountability, and the support needed to navigate challenges and continue making progress.

As part of the Built For This team, Shelby strives to help every client become the best version of themselves by providing the guidance, knowledge, and encouragement they need to succeed. Her ultimate goal is to empower people to recognize their potential, prioritize their health, and create lasting changes that positively impact every area of their lives.