Build strength and confidence with personalized training

Certified personal trainer serving Phoenix & Scottsdale, Arizona

Hi, I'm Nathan

I'm a Certified Personal Trainer with over 7 years of experience helping everyday people in Phoenix and Scottsdale build strength, lose weight, and create healthier lifestyles.

My own fitness journey began at age 29, when I turned to exercise and nutrition to help manage—and ultimately overcome—Irritable Bowel Syndrome. What started as a way to heal my body became a total transformation.

I gained muscle, lost body fat, and discovered a stronger, more confident version of myself. That transformation showed me the power of proper training and nutrition—and inspired me to help others do the same.

I believe fitness is for everyone—regardless of age, background, or where you're starting from. My clients range from seniors maintaining their independence to complete beginners taking their first steps into exercise. You belong here.

Originally from Ohio, I've lived in Los Angeles and now call Scottsdale, Arizona my home, serving clients throughout the Phoenix metro area. Before finding my passion for fitness, I worked in both real estate and the TV/film industry.

When I'm not training clients or working out, I enjoy playing guitar and spending time outdoors.

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Contact Me

My Appraoch

My training philosophy focuses on sustainable progress, not quick fixes. Here's what to expect:

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We start with a simple movement assessment to understand your current strength, mobility, and any limitations.

3. Create Your Training Schedule

1. Assess Where You're At

We'll design a realistic plan that fits your lifestyle, works at your pace, and adapts to your unique needs.

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We'll talk about your goals—whether that's weight loss, building strength, improving mobility, or boosting overall health.

4. Build Your Nutrition Foundation

2. Define Where You Want to Go

We'll discuss a nutrition approach that supports your progress without restrictive calorie counting.

Get started today!

Starting something new can feel overwhelming, but I'm here to make sure your first step into fitness is a confident one.

View Training Packages

  • Working with Nathan has been amazing. His training infused lasting health and strength in my body. Active bodies stay healthier than sedentary ones. I genuinely appreciate his positive influence.

    - Sharon

  • Without Nathan's scheduled training, I wouldn't exercise. At 84, I lifted 12-lb weights—couldn't have done it without his 5 years of guidance. He's been excellent for my family and me.

    - Jeannine

  • Working with Nate was the best decision. He's patient, knowledgeable, explains things well. I hit PRs and now deadlift 300+lbs! He genuinely cares and lets you pick the music. 🤘🏼

    - Manny

  • I recommend Nathan Koher as your personal trainer. After 3+ years at 65, I enjoy low body fat, strength, and confidence. He tailors each workout to my individual needs and literally saved my life.

    - Janis

Contact me

80/20 Fitness LLC
Nathan Koher, Certified Personal Trainer

The 80/20 Fitness Studio
6730 E McDowell Road, Suite 108
Scottsdale, AZ 85257