Backed by science, proven by results
No generic workouts. No wasted effort. Just intelligent training built around your metabolism.
★★★★★ 4.9 from 114 Google reviews
Personalized Training for Adults Over 40 - Backed by Science, Proven by Results
No generic workouts. No wasted effort. Just intelligent training built around your metabolism.
Precision Coaching for Adults Over 40
Every body is different.
Every goal requires a different strategy.
Choose the level of support that fits your needs - or let us guide you to the right starting point.
Stronger After 40
Our Signature Program
Best for: Weight loss, low energy, metabolic issues, plateaus
A fully personalized system—not just how it looks. We also offer kettlebell training.
Includes:
Comprehensive metabolic assessment
Personalized training & nutrition strategy
Biomarker-informed guidance
Ongoing optimization & accountability
Ideal if you want sustainable weight loss, improved blood markers, and long-term metabolic health.
Fit Over 40 Program
Structured. Safe. Effective.
Best for: Getting leaner, stronger, and healthier after 40
A guided training program built specifically for adult bodies—no extreme workouts, no burnout. We also offer fitness over 60.
Includes:
Age-appropriate strength training
Mobility and joint support
Metabolic conditioning
Professional coaching & progression
Perfect if you want structure, results, and expert guidance without customization overwhelm.
Private 1-on-1 Personal Training
Best for: Personalized support, accountability
Private coaching built entirely around you.
Includes:
Customized workouts
Technique correction & injury prevention
Goal-specific programming
Ongoing progress tracking
Best for clients who want maximum attention and fully individualized training.
Back Pain & Movement Support
Train Without Fear
Best for: Chronic back pain, past injuries, movement limitations
A corrective, strength-based approach to help you move better—and train with confidence. We also offer Pravilo.
Includes:
Movement assessment
Targeted corrective exercises
Core and stability training
Progressive strength rebuilding
Built on a corrective, strength-based approach — coached, progressive, and adjusted to your back.
Small Group Training
High-Level Coaching. Shared Energy.
Best for: Motivation, consistency, community
Small groups with professional coaching and personalized attention—without the price of 1-on-1. We also offer group fitness classes.
Includes:
Limited group sizes
Structured strength & metabolic training
Coaching cues and form correction
Supportive, like-minded community
Ideal if you want accountability, energy, and expert guidance in a group setting.
Not Sure Where to Start?
How it works
Discovery
Personalized plan
Results
The philosophy behind mobility, strength, balance, longevity
Why this approach is safer and more effective than cookie-cutter programs
Founder & Head Coach
Sergei Karaliou
Sergei Karaliou is the Founder and Head Coach of Underground Gym, where he specializes in metabolic transformation for adults over 40.
With more than 25 years of professional coaching experience, Sergei has worked extensively with high-performing professionals navigating weight gain, low energy, metabolic dysfunction, and the physical toll of chronic stress. He holds RKC Level 1 and Level 2, StrongFirst Level 1 and Level 2, and CK-FMS and Functional Movement Screen certifications.
He created Stronger After 40, the approach behind every program at Underground Gym, integrating body composition analysis, biomarker-informed nutrition, intelligent strength training, and recovery optimization. His work focuses on restoring metabolic function - not just driving short-term weight loss.... We also offer an InBody scan.
Online training
Distance learning
Can't make it to Underground Gym's Red Bank location? Don't worry we offer online training.
Our philosophy
Programs designed for you
We employ a comprehensive holistic Training System that addresses each person on the individual level.
Underground gym
We succeed when you succeed
Our professional success depends on your personal sports, fitness and life achievements.
See what our clients have to say
Individual results vary.
Contact Underground Gym — Red Bank, New Jersey
There is no time like the present to start working on your personal wellness, health & fitness goals. The personal trainers and conditioning coaches of Underground Gym can help you reach your goals. Contact us today to schedule a FREE training consultation.
CONTACT US
(732)693-0287
Underground Gym
327 Hwy 35, Red Bank, NJ 07701
Start Training Today: (732)693-0287
Ready when you are. Start with a free consultation: an InBody scan, a movement screen, and a clear plan. (732) 693-0287 · 327 Hwy 35, Red Bank, NJ 07701