About Us

Personal Trainers Marin County

Who are the McClintons?

Xavier Jarrell McClinton, The "X" in Body by X

Xavier, along with his wife Nadia, are the co-founders and partners of Body By X Skill Development and Training Center. He has been a personal trainer, an architect of mind, body and soul for more than twenty years. His vision for Body By X was to create a space where kids and adults could overcome their physical and emotional fears and improve their self-esteem. 

From X...

Having been in the fitness field for almost 30 years, I’ve seen a lot of people come and go. I began my career on the sales side and quickly realized that just selling people memberships was not the way to help them achieve long term success.  I realized that people needed help beyond just signing a contract. It was at that point that I decided to become a personal trainer. Since then I have helped hundreds of people reach their goals and sustain a healthy lifestyle. Growing up with the lack of a good role model inspired me to become a good role model myself. This is why I gain such satisfaction coaching, training and mentoring kids. We’ve included 2 pieces of equipment at the Center, a leg press and an assisted pull-up sized for kids as young as 6 or 7 years-old.
Over the years, I have learned to not just listen but to really hear the needs of people of all ages. It’s this ability that helps me to encourage people to move beyond their perceived limitations. For example, I help women gain the strength to do exercises using their own body weight, including push-ups and pull-ups. It gives me great satisfaction to see the confidence this instills in them.
I opened Body By X with my wife Nadia, to build a community of like minded people do like minded things.  I feel that this kind of environment breeds success.  This is an aspect of Body By X that I believe our members truly treasure.


Nadia McClinton, The “Body” in Body By X

Nadia manages the business side of Body By X including accounting, marketing and community outreach.  She is also the Center’s resident blogger!  She has worked in advertising, retail management and as a project manager for a software company.  She has a master’s degree in psychology and all of these experiences have prepared her well for gym ownership!

From Nadia…

Who am I?  Who I am today is a very different person than I was 10 or even 5 years ago.  I had never been to a gym before I met my husband and business partner, Xavier Jarrell, in 2006.  In fact, I guess you could say I was gym phobic!  I fancied myself as an outside exercise person, but my kids will tell you I was never really into exercise before X.  He inspired me to lift weights—it’s good for women’s bone health, he said.  I hired him as my personal trainer.  And while I fell in love with him I also fell in love with weight lifting.  It’s one of the most empowering things I have ever done—right up there with natural childbirth.  It has given me so much internal strength and confidence.  Enough confidence that this former gym phobic is now teaching indoor cycling and FlyGym classes!

My favorite aspect of owning a fitness center is being able to help people achieve their fitness goals.  It’s the most rewarding work I have ever done and I am proud to have a business that inspires kids and adults to build strength physically and emotionally.

First and foremost, we are Mom and Dad, sharing sports and fitness with our children is one of our favorite things!  Please stop by our gym to say hello and learn more about our philosophy. 

Personal Trainers Marin County

Body By X is Different!

Body By X, makes fitness accessible to everyone – from the very young to the young at heart.

People love its energy and rave about our fantastic music. At Body By X Skill Development & Training Center you’ll find all the key ingredients inherent in a quality gym:  memberships, personal training, indoor cycling, rowing, yoga and conditioning classes.

Additionally, Body By X has selected a team of experts in various fields such as nutrition, health and wellness, tennis and baseball coaches, chiropractors, etc. to give seminars to enhance the fitness experience. 
Upon joining the gym, members have access to all these professionals, totaling well over 100 years of experience.  

Our Trainers


Courteous and friendly
Energy packed workouts
Highly skilled and trained

You are important to us!


Our Facility


We love working out here too
Always clean and neat
Never overcrowded

Come experience the difference


Business Hours


Member Hours
Monday - Friday 5am to 9pm
Saturday 5am to 5pm
Sunday 7am to 5pm

Office hours by appointment.  Please call 945-9778.

Contact Us

Contact Us


Body By X
5768 Paradise Dr.
Corte Madera, CA 94925

Tel: (415) 945-9778

Contact us