Our Gym Offers What The Other Gyms Can’t

  • Personal training by certified trainers
  • Locally owned & operated
  • 24 hour access
  • Specialty lifting equipment for beginner to advanced lifters
  • Nutrition coaching
  • Cardio & crossfit equipment
  • Now you have no excuse to not come to the gym!
Signup Today
Underground Performance Gym

Get Fitter, Faster with Underground Performance Gym! We offer 24/7 access, the best in strength and cardio equipment, functional and personal training, & more.

Strength

Highest Quality Strength Training Equipment Ever Developed: Ivanco, Nebula, Icarian, Nautilus, Bodymasters, Cybex, Hammer Strength, Forza and One of a kind Custom Built Equipment!

Functional Zone

No matter where you are in your fitness journey, our functional training zones can help you get to the next level.

Cardio

State of the Art Cardio Equipment: Life Fitness Treadmills, Stepmills, Ellipticals, Crosstrainers, Keiser Spin Bikes, Concept Two rowers and more

Free Trial

Use our coupon to enjoy a 7-Day Free Membership. Bring a friend and you can workout together!
Click on coupon to take you to the 7 Day Free Trial page.

Signup Now
GYM VIDEO

Owner larry pollock explains why Underground Performance gym is different and what you can expect when you workout here.
Also, testimonials from trainers and gym members. Check it out!

Watch More
What Others Say About The Under Ground Performance Gym Difference

Love it here. Larry, the owner is a top notch professional, seasoned, honest business owner and trainer. This is a true training gym. Very pleased, as I’ve been in the other gyms in town and was not impressed. Thank you Larry for a fabulous addition to our community.

– Toni A.

This is a great gym. 24/7 access, lots of fancy new cardio stuff, a TON of machines, a power rack, monolift, two benches, and a deadlift platform. There’s lots of extras, too- the gym works with a mobile hydro body fat testing operation that comes by a few times a year, and hosts powerlifting meets a couple times a year. One of the things that make this gym really shine is the great community Larry and the others have built at this gym. Its definitely has the intimate feel of a private gym, but everyone is really friendly and helpful. If I’m not feeling great, I know I can just plop down in the office and chat with Larry and the trainers he has on staff. On that topic, the trainers here are awesome- they’re all competitive powerlifters with a multitude of certifications, awards, and more than a few records. Definitely the best gym in the county!

– Tricia P.

Larry, the owner, signed me up quick and painless. This is an awesome gym with great equipment. You can expect to find a lot of specialized equipment not usually found in commercial gyms. Whether you’re a bodybuilder, powerlifter, or someone trying to break a sweat, KO is where its at.

– Jacob S.

This is the the best gym in Ventura county, if not the state. Larry Pollock is the best trainer I’ve ever had. I was a competitive bodybuilder for years but have learned more from him in the last 6 months than I had in my competitive career. I am 64 years old and he has given me a strength building diet and powerlifting program and my lifts go up every week. The atmosphere is a “family” of people serious about training but welcome everyone. Everyone cares about your training and well being. I highly recommend this gym and Larry as a trainer. I’ve sent three people to him and they are all so happy and have seen major gains. The best!!!

– Marlene D.

The best way to describe KO GYM is a place that delivers an exceptional product by people who truly care. This is a place where you have every tool you need to get what you want, which WILL yield results. KO is a gym that cuts out the traditional corporate BS and focuses on the only thing that matters, the customer. I have always believed that a gym should be a place where you can not only have fun and get a great workout in, but a place that acts as a community similar to a massive family. This is what KO offers and coupled with its passionate owners and trainers, is really a gym you cannot find anywhere else.

– Mauricio A.

Old school machines….heavier weight….true gym. Better then Hollywood and Mavericks for lifting.

– Daniel T.

If you actually want to lift and get a great session in, this is the place.

– Laura R.

This gym has a great mix of equipment, trusted old school and new that works. Im now able to mix up my workouts to insure proper muscle stimulation as theres at least three machines that will target each muscle group along with a great selection of free weights. We are very lucky to have KO Gym in our community!

– Kenneth S.

×