Welcome to Rock Fit

Look Leaner.   Get Stronger.  Feel Confident About Your Body.

McLean's most effective personal training studio for women, offers you custom-built fitness and nutrition programs--
guaranteed to help our members and clients achieve their dream body and lifestyle.


The Rock Fit Community

Achieve Your Goals

Rock Fit has been featured in Fairfax Women's Magazine for providing a progressive, results-driven health & fitness experience, through holistic personal training programs, in a supportive, conscientious, and accepting environment with like-minded women.

Unlike other personal trainers, who don't listen, pay attention, or have the knowledge to empower you, Rock Fit delivers fun, feel-better workouts, with trainers that act as a source of encouragement by listening and being attentive to the specific needs of the individual.


Get to Know Us

Hi Ladies,

Welcome to Rock Fit!  You found our website for one, or more, of the following reasons:

        1. You’re looking for an honest, reliable source for fitness and nutrition methods
        2. You want to feel stronger and more confident about your body
        3. You want to know the TRUTH about proper weight loss and female fat-loss.


If so, then we're glad you're here.

If you are truly serious about achieving significant health and fitness results, and getting the body you've always wanted, then we are your solution. Don’t just take our word for it. Take a look at our client success stories to see how other women from the Falls Church, Arlington, and McLean areas decided to make a difference in their lives by transforming their bodies and lifestyles.

Are you finally ready to transform your body for good? If so, then fill out the form to schedule your Complimentary Fitness Consultation, a $97 value! We'll discuss our training programs and how we can help you get the strong and confident body you want in the most effective ways possible.

Committed to your Fitness Success,


Ken Diaz Founder, Rock Fit

Ken Diaz                         Founder, Rock Fit



Serving McLean, Falls Church, Arlington, Vienna, and Tyson's Corner areas.


Latest Blog Posts

Best Supplements for Women – Protein


On our most recent video on YouTube we talked about which supplement women should take to lose weight effectively and get more energy throughout the day.


(In case you missed the video, you can watch it here)


We’d like to continue talking about “Best Supplements For Women“, but this time about Protein – why you need it, daily intake, hormone in-balances, when to take it, and which protein powder is the best.


If you’re already working out with weights or thinking about joining a fitness program, our advice is to always take protein powder, before or after your workout, to replenish the muscles, and especially if you are lifting weights.


To lose fat and shed weight we need a certain amount of protein. Protein helps us become fat burning machines–and protein powders are highly recommended for women that work out using weights.


To learn more about protein powders, watch the video above.



Ken Diaz Founder, Rock Fit

Ken Diaz
Founder, Rock Fit

P.S.  If you feel sluggish, and struggle to get up and get moving in the morning, then check out our 28 Day Summer Fitness Challenge. We’re accepting applications by May 30th.


FIT&Lean Transformation Project – Fall 2015


We’re excited to announce our Fit & Lean Transformation Project for Fall 2015!

We are looking for 18 women that want to transform their bodies and not only like…but LOVE how they feel by the end of 2015!

This 12 week program will be very hands on with unique training and nutrition/lifestyle coaching to change habits.

Because of the limited space, we’re requesting only serious inquiries and applications. Positive attitude required!

To learn more and apply, inquire here –> http://j.mp/FitLeanProjectInMcLeanVA

Late Night Cravings for Carbs and Sugar?

3 Keys to Prevent Late Night Cravings for Carbs and Sugar:

  1.  Eat more lean protein during the day, especially on workout days.
  2.  Reduce and manage stress by making yourself a priority
  3.  Monitor your quantity and quality of sleep using a Fitness Activity Tracker


Contact us at 703-431-0442 to schedule a fitness diagnostic consult and discover which
Rock Fit training program best suits your personal fitness goals and needs.