Personal Training · Orange, CA

Build Muscle.
Lose Fat.
Reclaim Your
Strength.

Intelligent strength training and flexible nutrition for ambitious men over 35 — without living in the gym. First session is free.

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Coach Nate guiding a client through a training session in Orange, CA
8+
Years Coaching
B.S.
Kinesiology, CSU Fullerton
5★
Yelp Rated
35+
Built for Men Over 35
Coach Nathan Castillo, personal trainer in Orange, CA
Meet Your Coach

Nathan "Nate" Castillo

B.S. in Kinesiology from Cal State Fullerton and 8+ years coaching men through real transformations. Specializes in helping high-performing guys over 35 build muscle, lose fat, and get their strength back — through smart training and education, not guesswork.

Meet Nate →
How We Work Together

One Program.
Built Around You.

No cookie-cutter plans. No generic pamphlets. Everything is built specifically for your body, your goals, and your life.

1-on-1 Personal Training

1-on-1, in-person coaching in Orange, CA.

  • 100% custom workout programming
  • Online app access to your program
  • Nutritional guidance & better eating habits
  • Weekly check-ins with InBody analysis
  • Form coaching, injury prevention, real education
Pricing

Pricing depends on your goals and training frequency. Locked in during your free consult — no commitment, no pressure.

Book Free Consult First session free · Walk-through your plan

Custom Meal Plans

Add-on offering

Built around the food you already eat — modified for your goals. Not a restrictive diet. Ask about this on your consult →

Client Results

Real Men. Real Transformations.

A few of the men who put in the work. Tap through for the full stories on the Transformations page.

Juan's before and after transformation
JuanFat Loss
Brandon's before and after transformation
BrandonFat Loss · Mindset
Damian's before and after transformation
DamianMuscle Gain
See All Transformations →
What Clients Say

Straight From The Source.

Featured reviews from Yelp and Instagram video testimonials.

★★★★★

"I've gone to other trainers in the past and they're nothing compared to him. He won't cheat you or make you do some outrageous workouts — simple and straight to the point. If you're considering training with him, DO IT. You won't regret it."

— Gabby L. · Yelp
★★★★★

"He stood out from the rest because he was correcting his client's form as he was recording. He actually cared. He's going to actually help you reach your goals and do what a trainer is SUPPOSED to do."

— Moe G. · Yelp
★★★★★

"Went from 190-something pounds to 176. Lost fat, gained muscle. Knowledgeable, and overall a cool guy. Recommend training with Nate."

— Arturo M. · Yelp

Trained with Nate?

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Your First Session is Free

Ready to Reclaim
Your Strength?

Tell me a bit about you and what you're after. I'll reach out within 12 hours.