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METTLE Fitness Co.

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Training location

Responds in about 3 hours


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About
NEW YEAR’S RESOLUTIONS? Become a whole new you! Let’s GO! I'm Derek Stern, a Certified GLP-1 Coach and provider, Personal Trainer and Nutritionist, and I help people transform their bodies and lifestyles through customized fitness, peptide and nutrition programs. If you are on any weight loss program or GLP-1, you have requirements for fitness and nutrition that are specific to your journey. My approach goes beyond workouts and meal plans — it's about education, accountability, and building sustainable habits that last. I don't just help clients lose weight and/or build muscle; I help them gain confidence and control over their health. I turn setbacks into comebacks. I help clients take control of their fitness and nutrition so they can rebuild confidence, strength, and self-discipline from the inside out. Every plan is personalized, every session is purposeful, and the goal is simple: help you become the best version of yourself — body, mind and spirit. I am friendly, fun, personal, punctual, attentive and I form a strong bond with my clients that establishes strong accountability and all of my clients reach or exceed their goals with challenging, effective workouts. Contact me today and let’s get to work!
Overview

Serves Marysville, WA

Background checked

1 employee

1 year in business

Business hours

This pro hasn't listed their business hours.

Payment methods

This pro accepts payments via Apple Pay, Cash, Check, Credit card, Stripe, Venmo, and Zelle.

Social media

Instagram

Services offered
Event to prep for
Fitness goals

Lose weight

Get toned

Build muscle

Gain flexibility

Client age

Younger than 18

18 - 22 years old

23 - 30 years old

31 - 40 years old

Projects and media
Projects and media
Reviews

Customers rated this pro highly for work quality, responsiveness, and professionalism.

Exceptional 5.0

12 reviews

5

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Melinda w.

Oct 23, 2025

Derek is encouraging, knowledgeable and very professional. I highly recommend him to anyone looking for a personal trainer who genuinely cares about your progress. I appreciate how patient and focused he is on helping you reach your goals.
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Susan S.

Dec 12, 2025

I can’t say enough good things about Derek. He’s funny, welcoming, and incredibly knowledgeable, which makes every session something I actually look forward to. From day one, he made me feel completely comfortable and never intimidated, no matter where I was starting from. He took the time to really understand my goals and limitations and created a workout plan that truly works for me. It’s clear he’s smart about what he does and genuinely cares about his clients’ success. I highly recommend him to anyone looking for a trainer who knows how to get results while making the process enjoyable.
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Pamela G.

3 weeks ago

I’ve only been working with Derek for a couple of weeks, but I already appreciate how encouraging and supportive he is. He’s great at giving clear instructions, checking form, and reminding me when I’m doing things right. His positive energy makes workouts feel more approachable and motivating.
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Valerie C.

Oct 19, 2025

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Adrienne H.

Oct 18, 2025

Working with Derek has given my life meaning again. Being a 53 year old grandma with a spinal injury, I truly thought it was time to sit down and accept that my body is just not what it used to be. But oh no, since working with Derek and his knowledge on teaching me how to continue to work out without injuring myself, I have hope again. And for that, I will be forever grateful. Thank you dearly Derek and God Bless.🤗
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Derek Stern

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