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Meet Our Coaches

We want to take a moment to write about the League of Xtraordinary Fitness coaching staff. We believe that coaching is critical to your experience and is something that differentiates LXF. Anyone can become a Crossfit coach by meeting all the requirements of a Level 1 Certification seminar. That certificate is only the foundation for our coaches at LXF. We strive to hold our coaches to a higher standard. Each member of the staff is chosen for their ability to engage with athletes of all levels, their ability to teach athletes to perform movements safely, their enthusiasm for building the LXF community, and their passion for learning and building their own technical expertise.

Each of our Coaches have come up through the ranks as members of League of Xtraordinary Fitness. Most of our coaches have been learning exclusively from at LXF for 1 to 3 years. They’ve become proficient in our exclusive techniques that have brought success to all of our athletes. This experience is invaluable and is the key ingredient in the application of our coaching techniques. Our coaches engage in continuing education through regular clinics at CrossFit Proven. These clinics focus on the development of their technical expertise. Each coach goes through an inclusive and intensive apprenticeship under the direct tutelage of Matt and each have demonstrated a complete proficiency and efficacy as a coach before they are able to lead classes at CrossFit Proven. Our coaching staff also participates in seminars and receives certifications outside of LXF’s in-house program like; CrossFit’s Olympic Lifting Certification and CrossFit Mobility.

Our staff has a commitment to excellence and constant learning. LXF coaches will always put the needs of LXF athletes first when we are at the box. We know that one thing you ask of us and the other coaches is to give you the best effort we have everyday and ensure you have the best experience possible. We pledge to you, our members and our staff, that we will strive everyday to deliver that best possible experience. Exceptionalism is our standard. Below, you can read brief bios on each of the LXF coaches.

Thank you for making LXF the best place to be a coach.

Aliyah Emas


Owner & Head coach. Aliyah has over 12 years experience working in the Health & Fitness Industry. She has her Masters in Exercise & Sport Sciences along with many other certifications and specializations. Her hands-on experience covers diverse populations; from corporate fitness to athletic performance, from senior fitness to nervous system disorders. If you’re injured, she knows how to bring your health and performance back to where it was prior to injury, if not exceeding it. Her passion is fitness, period; she lives and breathes it. When working with people, you can just tell she has an intense love for what she does. Although a stickler for form, she enjoys making one-on-one sessions and classes fun and engaging. Outside of helping others achieve their best, Aliyah rarely keeps still. She is always striving to conquer new challenges and live every adventure. She strongly believes that with fitness, she has no limits; she should be able to jump into any athletic endeavor and come out successful. With that said, she has participated in a wide array of athletic arenas – rowing, softball, CrossFit, bodybuilding, strongman, obstacle course racing, ninja, marathons, triathlons, and so much more. So when she isn’t coaching, it is safe to say she is somewhere out there doing something crazy.  AKA training and traveling from competition to competition…usually with her trusty sidekick Peanut Chew in tow, her pup. Outside of that she is a Peanut butter lover who enjoys game nights, baking paleo treats, and Super Nintendo.

Chris Lebresco

CrossFit Level 1 Trainer

Chris is one of many CrossFit Proven success stories. Back in April of 2013, Chris came to Proven overweight and out of shape. After only 8 months of dedication to CrossFit along with a healthy diet, Chris was able to shed 50lbs and become stronger and healthier than ever before. During this transformation, Chris’ passion for CrossFit grew and now as a coach he is looking to help others reach their fitness goals. Chris enjoys staying active by running, biking and swimming and frequently competes locally in 5k runs, bike races, triathlons and CrossFit competitions. He also plays basketball, deck hockey and tennis whenever he gets a chance. Chris’ goal as a CrossFit Trainer is to help CrossFit Proven members take their athletic abilities to the next level and to see members constantly improving. When Chris isn’t coaching or working out, you can find him taking care of his two children Nick and Brooke and trying to keep up with his CrossFit wife, Lindsay. You may also run into Chris out at your favorite bar or restaurant where he regularly performs as a solo acoustic act throughout the Philadelphia area.

Brian Parks

CrossFit Level 1 Trainer

Brian has been passionate about fitness for over 30 years, including gym memberships, running, adventure racing, golf and other outdoor activities. He is also an avid woodworker and gardener. He found CrossFit through friends in 2011 and was instantly addicted to the workouts, the atmosphere and the community. Brian has a passion for teaching others and is motivated by helping other athletes excel at all aspects of CrossFit. When not at the box, Brian enjoys spending time with his family and can be found watching his daughters compete in equestrian events and field hockey.

Ben Searles

In 2018, after making some lifestyle changes, I was diagnosed with type 2 diabetes out of the blue.  In the next three months, I had gained over 90 pounds and found myself out of breath after just tying my shoes.  Not to mention my glucose numbers were in the 375 – 400 range, where my goal would be between 100-150 range.  After modifying my medicines (insulin), my primary care physician and endocrinologist suggested I start a workout regimen.  I knew exactly who to call, Proven Fitness. My first day was not what I expected at all.  Much more intense and overwhelming.  Coach Matt reassured me that the exercises could be scaled down to my comfort and the class was so welcoming I knew I found the right spot. When I went home after my first class, I checked my glucose number, and it was 126!  I will never forget that number.  I have been hooked ever since and jumped at the chance to coach! Outside of coaching, my interests include the holistic lifestyle, nature, and spending time with my family. I have been athletic to some capacity all of my life but with no real discipline. “Work out with intention!”  “Don’t cheat yourself, treat yourself!”

Matthew Chambers

CrossFit Level 2 Trainer | CMT

Matthew Chambers has over 20 years experience working as a professional Strength and Conditioning Coach. Professional athletes, homemakers, seniors and children alike have seen great success working with Matt; and you will too! Coach Matt has developed hundreds of coaches all over the world working as an instructor at the National Personal Training Institute since 2004. Matt has been a CrossFit Affiliate owner since 2007. Through that time he’s helped teams and individuals make it to the CrossFit Games Regional four times including a trip to the CrossFit Games. When Matt isn’t coaching he spends time with his family, whom you will also find at the box on a regular basis!



Brittany YC

CrossFit Level 1 Trainer | MSW, LSW, CCTP
Eat To Perform Certified Nutrition Advisor

Brittany Yilmaz-Chambers has always had a passion for community and connecting with others. Pursuing this passion first through volunteer work, then yoga and cross training during her college career, and later professionally as a social worker, Britt discovered that she could also fulfill that passion with health and wellness. CrossFit quickly captured Britt’s heart and she attained her CrossFit Level 1 Trainer certificate one year after starting CrossFit in 2013. Britt strives to share all aspects of wellness with those she encounters in hopes of helping members achieve their goals and find the fulfillment offered at LXF. With a dedication to holistic healing, clean eating and connecting with the power of God and self, Britt believes fitness is much more than exercise. When Britt’s not coaching, you can find her working with her nutrition and therapy clients, training and spending time with her family and friends.