Xtreme Gym 24/7

1800 W. Oxford Ave Unit L Sheridan, Co. 80110


1800 W. Oxford Ave Unit L Sheridan, Co. 80110



Xtreme Gym 24/7 Owner Greg Miller, Krav Maga Instructor,

Currently a Sergeant in Law Enforcement and has worked in Law Enforcement for 25 years.
Sgt. Miller is the head Firearm Instructor and Defensive Tactics/Arrest Control Instructor for his Department, Teaching Law Enforcement Krav Maga.

Once Sgt. Miller began training in Krav Maga he found that it was the most effective fighting system / Self Defense or protection system in the world. Krav Maga is not a sport, it is a system based on principles and concepts.

In 2009 Sgt. Miller became a Krav Maga Instructor and switched  his Departments Defensive Tactic/arrest control to Krav Maga. In 2013 Sgt. Miller became an Official Licensee of Krav Maga Worldwide Inc, so he could teach to others outside of Law Enforcement.

Sgt. Miller loves to train in Jiu-Jitsu and is currently a blue belt under Steve Hordinski Owner of Relson Gracie Jiu-Jitsu Academy Littleton, Always a Gym Rat since he was 16years old,  being involved in Bodybuilding, Power Lifting, Fitness. Him and his wife opened Xtreme Gym 24/7, with the concept of the one stop place to train. Weight Lifting, Fitness Equipment, Cardio Equipment, Mat Space, Krav Maga Classes,  Jiu-Jitsu Classes, etc. All under one roof. Email:greg@xtremegym247.com

Xtreme Gym 24/7 Owner Jackie Miller, Fitness Instructor,

Jackie has been in fitness for the last 30 years. Is your health worth fighting for? If so, let her help you get your workouts back on track this month! Commit yourself to getting back to fitness and challenge yourself.  The Krav Maga 6 week challenge.

Jackie first started to train in Krav Maga in the home garage by her Husband Greg Miller. Then in July of 2013 she opened Xtreme Gym 247 and went out to the Krav Maga Worldwide in LA in Sept. and absolutely fell in love with Krav Maga .....she was sold on all the fitness and self defense moves and couldn't get enough. Since that trip Jackie along with other Krav Maga instructors developed her Krav Fitness Classes and started the Krav Maga 6 week Challenge. So if your interested in fitness or self defense classes contact Jackie Miller Email: Jackie@xtremegym247.com

Drew Miller Instructor:

At the age of 14 Drew Miller started his fitness journey in Jiu-jitsu at Relson Gracie Academy and at the age of 16 he earned his Blue Belt. Since then he has also trained in Krav Maga and Jiu-Jitsu. Now at 18 Drew is currently getting ready to be certified in Krav Maga/Jiu-jitsu and is assisting with instructing Krav Maga and Jiu-Jitsu classes.


Chris Cannaverde

ACSM Certified Personal Trainer

AS Fitness Specialist

Chris has been in the personal training industry since 2008.  Working with a wide variety of clientele ranging from high level athletes to senior citizens, Chris is confident and he can help anyone reach their fitness goals. 

Personal message

“Health should always be your #1 priority.  Lack of a strong body and mind will limit
your ability to live life to its full potential.”


Body transformations

Fat loss

Strength and hypertrophy

Corrective exercise

Metabolic conditioning

Beginner exercise instruction

Nutrition analysis