Josh Miller
Owner of O-SEA CrossFit, CrossFit Games athlete, and San Clemente coach helping beginners, athletes, and everyday people get stronger through expert coaching and real community.
About Josh Miller
Josh Miller is the owner and head coach of O-SEA CrossFit in San Clemente, California. He is a CrossFit Level 3 Trainer, one of the highest coaching credentials in the sport, and a lifelong competitor who has trained CrossFit since 2012. In 2025 he placed 22nd in the Men's 50-54 division at the CrossFit Games.
Before the gym, Josh spent fifteen years in restaurants: serving, bartending, and managing. He coaches from the same instinct it taught him, which is to read what the person in front of you actually needs and then help them get there. That blend of real competitive experience and genuine warmth is what members name again and again in their reviews.
Josh leads the O-SEA coaching team and shapes a culture that is serious about training and still welcoming to a complete beginner. He owns the CrossFit side of O-SEA and helps lead O-SEA Fit, the personal coaching side, so the same coaching depth reaches people whether they want group classes or one-on-one training.
Elite experience, brought down to your level
Josh has competed at the CrossFit Games and brings that same high-level understanding of movement, training, and coaching into the everyday O-SEA environment. You do not have to be elite to benefit from elite coaching: it just means every movement is taught well and every workout is scaled to you.
Expert coaching, scaled to the person
Josh's coaching philosophy connects elite-level coaching to real people. The goal is never to make training intimidating. It is to make expert coaching feel welcoming and within reach for whoever walks in.
- Teach every movement well, before adding load or speed
- Scale every workout so it fits the person, not the other way around
- Meet people exactly where they are starting from
- Build the consistency that turns a few visits into real change
- Make fitness feel welcoming, not intimidating
- Use coaching to improve real life outside the gym
One coaching team, two ways to train
Josh Miller and the O-SEA coaching team support two connected but distinct training experiences in San Clemente. Same coaching standard, two different doors.
O-SEA CrossFit
Coached CrossFit classes, scaled workouts, drop-ins, beginner support, and the energy of training together in a welcoming San Clemente community.
Train at O-SEA CrossFitO-SEA Fit
Personal training, semi-personal coaching, youth training, remote coaching, and holistic fitness for a more individualized path.
Explore O-SEA FitCoaching in San Clemente
Josh Miller coaches in San Clemente, California, serving members and clients from San Clemente, Dana Point, Capistrano Beach, Talega, Rancho Mission Viejo, San Juan Capistrano, and across South Orange County. You will find O-SEA CrossFit at 1504 Avenida de la Estrella, Unit H.
Frequently asked questions about Josh Miller
Who is Josh Miller?
Josh Miller is the owner and head coach of O-SEA CrossFit in San Clemente, California. He is a CrossFit Level 3 Trainer and a CrossFit Games competitor, and he leads the O-SEA coaching ecosystem.
Is Josh Miller the owner of O-SEA CrossFit?
Yes. Josh Miller owns and leads O-SEA CrossFit in San Clemente, and he coaches in the gym.
Is Josh Miller connected to O-SEA Fit?
Yes. Josh Miller leads the broader O-SEA coaching ecosystem, which includes both O-SEA CrossFit and O-SEA Fit, the personal training and coaching side of O-SEA.
Has Josh Miller competed in the CrossFit Games?
Yes. Josh has competed at the CrossFit Games, most recently placing 22nd in the Men's 50-54 division at the 2025 CrossFit Games. He has trained CrossFit since 2012.
Can beginners train with Josh Miller's coaching at O-SEA?
Absolutely. Josh's coaching is built to make elite-level experience welcoming and scalable. Every workout is scaled to the person, so beginners and everyday members are coached at exactly the right level.
What is the difference between O-SEA CrossFit and O-SEA Fit?
O-SEA CrossFit is the group CrossFit side: coached classes, scaled workouts, drop-ins, and community. O-SEA Fit is the personal coaching side: personal training, semi-personal coaching, youth training, and remote coaching. Both are led by Josh Miller and the O-SEA coaching team.
Train with Josh and the O-SEA team
Book a free consultation and meet the coach who will guide your first class.