About Us - MBX Fit
By Appointment Only

Meet Your
Montclair Personal Trainers

Montclair New Jersey Personal Trainer Thelis Negron


Thelis Negron is the MBX founder and developer of the MBX 12 Week personal training program. Thelis has a Bachelor’s degree in Sociology from Haverford College, a Mental Health Master’s degree from UMass, and several personal trainer certifications from the National Academy of Sports Medicine (NASM), the top ranked school for personal training, nutrition and physical therapy in the country. Thelis is also a certified Life Coach through an ICF accredited institution. She began her personal training career in Hollywood, CA where she worked with a high-end clientele inclusive of celebrities, and was also featured on weight-loss reality shows and well known fitness magazines. She has now been personal training for 15 years, drew from her 5 years of experience as a Marriage and Family Therapist and combined it with her skills as a certified Life Coach to develop a unique mind training technique which she has coined “Mind Coaching.”

“Mind Coaching is an eye-opening technique to get you to see why you’re not getting the health and fitness results you want. At MBX, we help you learn the facts about nutrition and how to break bad habits by replacing them with better ones for your best diet and fitness health possible.” – Thelis Negron

Thelis speaks 4 lanugauges, has lived and traveled all over the world from Europe, to South America, Africa and Asia and has also lived in several major cities in the U.S. including Philadelphia, Manhattan, Los Angeles, and had resided in Montclair, NJ when she opened MBX.

Connecting with people is Thelis’s passion. Finding a way to connect the mind and body has been her goal since becoming a personal trainer, then therapist, and now life coach. Through her unique combination of education, life experiences, professional background, and industry knowledge, she has developed an innovative, sophisticated, and revolutionary program that integrates the principles of personal training with her MIND Coaching techniques simultaneous in each session.

Thelis’s Sessions Start at
$125 / 50 mins
Pricing based on 2/week or 3/week packages

Montclair New Jersey Personal Trainer Thelis Negron
Montclair New Jersey Personal Trainer Treytan Knott


Treytan Knott, the latest addition to MBX, is Thelis’s apprentice and a perfect fit for the team! Treytan has an extensive background in exercise physiology (anatomy, biomechanics, strength and conditioning), sport psychology and motivational techniques, as well as vast knowledge of nutrition and supplementation.

Treytan was always active growing up in a family that loved to camp, hike, and play sports. He found a passion for exercise in high school at the age of 14 and eventually went on to pursue a Bachelors of Science degree in Exercise Science. It was around this time that he realized his thirst for knowledge was unquestionable and loved researching new peer-reviewed training techniques, nutritional strategies, or supplements. Originally researching to help his own progress in the gym and avoid workouts, nutrition or supplements that don’t actually work, Treytan realized everyone could benefit. It was then that he began training others to help them avoid common mistakes or pitfalls. He successfully trained for several years on his own after that and was approached by LA Fitness to manage the personal training department of one of their clubs, after a year and a half they approached him again to oversee multiple clubs as a District Manager.

Treytan is a great fitness trainer who is passionate about helping people become the best version of themselves by not only motivating, but by educating clients on why certain workouts are setup the way they are or why certain nutritional strategies or supplements can either benefit or hinder his clients’ progress. With his knowledge and experience in diet, health and wellness, sport-specific and athletic training, rehabilitation and physique specializations, we know he will be a perfect fit for you too!

Treytan’s Sessions Start at
$105 / 50 mins
Pricing based on 2/week or 3/week packages

Montclair New Jersey Personal Trainer Treytan Knott
Improve Your Life Today

MBX 12 Week Program

In 12 weeks you will acquire all the knowledge and information about your diet and fitness needs to maintain your results for the rest of your life.

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