Marcos Castro lightening bolt

Verified 5 Reviews
location-iconOutdoor & In-Home
vaccinated COVID-19 Vaccinated

About Marcos

I started off by joining a golds gym challenge in my hometown of Brownsvill, Tx, 2014, and went on to win the challenge. That's when I realized my competitive nature and love for training. Becoming a personal trainer has enabled me to meet people I would not have met before, and because of this my clientele includes age groups from teens to elderly. 

A typical first session involves planning for client goals, assessment of form and posture and planning scheduling needs. Once the first session is completed I check in with clients via text and am always available by phone call/text to anwser questions.

I am currently a certified personal trainer by the accredited agency NASM and stay up to date with current science based evidence in fitness by aquiring new certifications.

My favorite client story

Since working with me, my client Laurie has lost 105lbs. Recently her son had car trouble and when she offered to help him push it to a different location he said ‘no way, you can’t help me’. She then helped him push the car, something that could never have been done if she hadn’t trained.

My favorite exercise

Any exercise involving legs. Leg workouts used to be my least favorite because it was my weak point, but due to my progression it is now my favorite.

My favorite quote

If you don’t use it, you lose it

My training philosophy

When starting out on a goal it may seem extremely hard. Through my enthusiasm and knowledge of fitness, I can only want my client to eventually feel the same.

My training experience

Freedom fitness Brownsville Tx 2014
LA fitness Denton Tx 2015
Lifetime fitness Flower Mound Tx 2015
Golds gym Richardson Tx 2016 2018
Extreme iron pro Dallas,Tx 2016 2020
Home studio/virtual/ client in home 2020 current

Areas of Expertise

  • Strength Training
  • Weight Loss
  • Flexibility and Mobility
  • Muscular Definition
  • Muscle Gain
  • Posture
  • Kettlebells
  • TRX
  • Functional Training
  • Corrective Exercise
  • Nutrition
  • Cardiovascular Conditioning
  • Injury Prevention
  • Stress Reduction

NCCA Accredited Certifications

AFAA Certified Personal Trainer
NASM Certified Personal Trainer

Additional Certifications

NASM Corrective Exercise Specialist, NASM PES

Who I Especially Like Working With

Beginners, Cancer Survivors, Youth

Medical Conditions Experience

ACL tear, Addiction, ADHD, Andropause, Ankle Injury, Anxiety, Arthritis, Asthma, Hamstring Issues, High Blood Pressure, High Cholesterol, Hyperthyroidism

Additional Languages Spoken


I was extremely overweight and had been to several trainers before and not had any luck. I was about to give up and met Marcos. He was the only one that took the time to understand my true needs and customized my workouts for a complete beginner. He always motivated me and pushed me to improve myself all of the time. As I got stronger he adjusted my workouts to fit my new strength. I've been with him for 7 years ... even when I had to have surgeries he customized my workouts to strengthen me. I have been able to enjoy a much healthier lifestyle and can do so many things I once was not able to do. I would truly recommend him as a personal trainer.

Laurie J.

When I first interviewed Marcos 5 years ago, I seriously thought “this guy can’t be real, he’s too good to be true”. Five years later, I’m so happy to have been proven wrong. Marcos really is just that great. His attitude is always bright and positive. He instantly energizes you and gets you going. And it’s not “forced” it’s infectious. Like, his being pumped gets you pumped. After a bad day at work, this is so important. His style is very adaptable. I already had experience and he merged his workouts in with what I was used to in a way that helped me move up to a higher level. The man knows how the body works and how to properly exercise it to get the results you want. On an equally important point, Marcos understands limits. He has elderly clientele with special concerns, and he has me - I’m perpetually “falling apart” with some accident or another. Marcos has been as critical to my recoveries as my physical therapists have been. I highly recommend Marcos. He’s fun, kind, dedicated, empathetic and an all round great trainer.

Mark M.

Marcos is very knowledgeable and works with you to get you to your best, as everyone is at a different place with their workout goals. Marcos is very flexible to when things arise that cause schedule changes. He also makes the workout fun!

James D.

Marcos is an excellent trainer. He is able to adapt workouts to your needs and always challenges you to take it to the next level! I’ve been his client for a few months and already have seen great results. I definitely recommend him to anyone looking to work on their health & fitness. You won’t regret it!


Marcos is a great trainer. Every session I have had with have been positive. He explains the parts of the body that are being targeted by the experience. More importantly, he explains how to execute each exercise. I highly recommend him to anyone seeking to work with a trainer.

Domingo C.

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