Billy Corbett's Personal Traning

Fitness from the InsideOut








Hours of Operation

Mon. - Fri:
6am - 7pm

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Our Services


Personal Training

Our Classes


Don’t want to be in a big group? At RetroFIT Training Center, we understand! Private training is an excellent option for someone who prefers 1-on-1 (or semiprivate, with 2 to 4 people) coaching as their primary form of training. It’s also a good choice for people with variable schedules such as athletes, executives and stay-at-home mothers. Billy and his highly qualified trainers personalize your workout so it caters to your individual needs and goals. Already in decent shape but need a change of routine or help getting momentum again? Private training can be just what you need. Let us help you with any of the following:

  • Accountability

  • Program design 

  • Reduce body fat and weight loss

  • Increase energy and stamina

  • Better balance, mobility and flexibility

  • Enhance work, recreation and sport performance

Please call us (303-758-3138) or e-mail to schedule your assessment and interview today.


Client Testimonial:


Liz Adams Client of the month

Name: Liz Adams

Hometown: Albuquerque, NM

Age: 45½

Favorite Hobby: cooking

Biggest Sporting /Fitness Accomplishment or Moment to Date: ½ Ironman in 1999 and running down and up the Grand Canyon in 1 day in 2009

Next Sporting/ Fitness goal:

Hiking “The Dome “in Yosemite and running a ½ marathon with my husband for his 50th birthday.

Training Specifics

When did you start training? Now that’s a loaded question. I started training in Washington, D.C in 1987 – went to the next level in 1993 when I ran my first marathon – started a whole new phase January 2010…..

How many days a week are you training/exercising? 5 days: 2 days on weights, 2 days in Boot Camp and one day on my own – sometimes 6 days if I decide to chase my 15 year-old daughter on a run.

Favorite RetroFIT drill - Anything on the Rail Yard™

Least Favorite RetroFIT drill – anything having to do with stretching – oh yeah, and if the step machine were a drill I’d say that, too.

Training goals this year: Aesthetically, I want to get rid of the “easy carry handle” on my six pack and the layer of padding that’s hiding all the muscle I’ve been building. Fitness-wise I want to be able to run, hike and bike with ease.

Explain your training experience: Gosh, I’ve been through so many phases. Right now I’m in the restructuring phase. I have worked out with Billy for 5 or 6 years and have always given it a strong effort. The catch is that I would pick and choose from Billy’s plan – from training to food to supplements. Beginning in January I decided to focus and do all of what Billy had in store for me. My body has changed more in the last 4 months than since I started training. I think my biggest lesson about food is not that I “can’t” eat things – I just “don’t” eat them because they don’t help me reach my goal. And my biggest lesson about training is that I deserve to focus on me and my body for at least 1 hour a day.

How is the training going? Great!

Words from Coach Billy:

I think she is best described by fellow RF trainee Dan who nicknamed Liz, “The Hammer “. Her commitment, teamwork and work ethic is admired and appreciated by all those she has trained along side at RetroFIT Training Center.

As a example of her commitment she never missed a day of training while she ran a family while simultaneously running a campaign to run for Colorado State Representative.

That’s commitment!


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Billy Corbett's RetroFit of Denver - 2538 South Colorado Blvd. (Inside Jazzercise) Denver, CO 80222 - 303 758-3138