Tom Hill

CrossFit Coach


State University of New York, Bachelor of Arts Degree
Multiple time All State NJ High School Wrestler
Multiple time All State NJ High School Baseball Player
Professional Baseball Player (Kansas City Royals)
ISSA Sports Specific Nutritionist
CSCS Strength and Conditioning Coach
NASM Performance Enhancement Specialist
RKC & HKC Kettlebell Certified instructor
CrossFit level 1 Coach
CrossFit Olympic Lifting Certified
CrossFit Gymnastics Certified
CrossFit Judge Certified
Emerson High School Hall of Fame Inductee

Tom Hill has been in the fitness industry since 1998. His intense dedication to fitness began at a young age. Tom was given a gift that allowed him to succeed in athletics and fitness. At a young age, Tom became recognized as a 3 time New Jersey state wrestling champion. Tom was also recognized for his baseball talents at state and national levels. Dedicated to making the most of his ability, he knew training and nutrition would be the biggest supporter for his success. After noticing the difference fitness has on his success and life, Tom wanted to use his gift and knowledge to help others achieve their fitness goals.

Over the past 15 years, Tom has trained and studied under many highly trained coaches in various areas of expertise. Having the opportunity to train and study under these coaches gave Tom the skills necessary to succeed and be an effective gym owner and coach himself. Tom has a strong background in speed and agility training, powerlifting, Olympic style lifting, kettlebells, gymnastics, and sports specific training, as well as, sports specific nutrition. Tom’s experience includes having worked with Professional UFC fighters, World Champion Jiu-Jitsu competitors, Professional football and baseball players, American Rugby athletes, and high school wrestling and baseball teams. Tom’s experience has provided him expertise in athletic training and preparation. Tom’s approach to CrossFit is different from that of most CrossFit gym owners.

Tom’s athletic theory is based upon a different, more advanced philosophy. It is based upon years of research and training various athletes, including his experience as a catcher on the Kansas City Royals. Tom’s model concentrates on enhanced athletic performance. He believes performance is not measured by skills practiced in sports, but by the development of physical elements such as speed, strength, agility, quickness, balance, and power. After experiencing first hand the results of a balanced Strength and Conditioning program, combined with Mobility, and Nutrition, he strongly believes that these three components are the key to success. If one of these three components is missing the results a person is looking to achieve can be greatly affected and in the long run can lead to imbalances and injury. Tom has taken this belief and transformed it into the cornerstone of CrossFit ATR.

At CrossFit ATR every client that walks through the door is provided with the knowledge of the proper movement patterns of each lift, an in depth breakdown of the mobility and range of motion issues based on their skills and ability, along with the knowledge to correct those issues.

Providing our client’s with this knowledge significantly increases our client’s ability to achieve their goals. Tom’s common quote says it all, “You tell me your goal. I’ll show you the path. Together we can accomplish anything”.

Arturo Fiero

CrossFit Coach


  • CrossFit L1
  • CF Gymnastics Cert
  • CF Oly Cert
  • Ace Personal Trainer
  • USAW L1

Seminars attended

  • Advanced Olympic Lifting Seminar with David Miller
  • Olympic Lifting Seminar with Mark Cannella
  • RX Smart Gear Double Under Clinic
  • MA Strength Chineese Weightlifting

Arturo is a CrossFit Level 1 Certified Trainer. Originally from Staten Island, NY, Arturo came to San Diego in 2007 which is when he discovered CrossFit. Since then, he’s amassed a wealth of experience in each CrossFit modality- weightlifting, gymnastics, and metabolic conditioning.

He is known for his gymnastic expertise and how it translates into athletic function, particularly in the grappling arts. Arturo is an avid grappler with over a decade of experience in Wrestling and Jiu-Jitsu and believes that CrossFit serves as a great base for someone looking to become an athlete of any kind.

Dr. Claudia Chaloner

Physical Therapist


Dr. Claudia Chaloner received her Doctorate of Physical Therapy with high honors from the University of St. Augustine for Health Sciences in California and her Bachelor of Science degree in Health and Exercise Science from Furman University. While at Furman, Claudia was active on the Women’s Rugby team and was selected to compete for the USA Women’s Rugby U-23 South All-Star team. Prior to college in her home state of West Virginia, she competed as an amateur boxer for five years. She discovered Crossfit in 2007 and fell in love with the intensity of the sport and the camaraderie of the community. Now, Claudia competes in raw powerlifting placing 6th in the 63kg open class at USAPL Raw Nationals in 2016 and placing 3rd at the Arnold Sports Festival in 2017. Her top numbers in competition have been 158kg/347lb squat, 78kg/171lb bench, and 175kg/385lb deadlift at 132lbs bodyweight.

Claudia has spent over 10 years working in the fitness and wellness industry as a personal trainer, community wellness volunteer, and children’s sports coach in the USA and in New Zealand. Outside treating, she enjoys traveling, painting, spending time with her husband and fur babies, and volunteering with a therapeutic horsemanship program for veterans. She also co-hosts the LionHeart Radio Podcast, promoting active lifestyle. Claudia holds her CF Mobility certification, CF level 1 trainer certificate, and has completed training in Postural Restoration Institute (PRI), Functional Movement Screen (FMS), and Selective Functional Movement Assessment (SFMA).

As a physical therapist, she is committed to improving not only the lives of her fellow athletes but any individual experiencing dysfunction. As an athlete and coach, Claudia understands the demands of high-intensity training and realizes the necessity of efficient movement patterns and education in order to achieve and maintain optimal performance. Due to personal injuries, she can relate to the frustrations of receiving therapy services provided by professionals who are not educated about correct movement patterns and high-intensity training. She hopes to bridge this gap by providing empathy, encouragement, and knowledge. Claudia is ready to equip fellow athletes with self-maintenance tools and train individuals to move for LIFE.

Sean Ryan

CrossFit Coach

A native to San Diego he was born and raised in east county and went to San Diego State to get his bachelors in psychology specifically in behavioral health. Through high school and college Sean always had an interest in physical movement specifically powerlifting and bodybuilding that changed with a severe car accident that limited his ability to perform the activities that he loved and as a result he began practicing yoga. Through yoga and mobility exercises he was able to regain his strength and range of motion from his previous injuries and shortly thereafter got his certification as a yoga instructor. at the same time Sean became a yoga instructor he also found CrossFit and was immediately hooked. After two years of being a student of CrossFit Sean began crossing over his yoga and mobility techniques on to his CrossFit students using techniques he had learned through yoga teacher training and mobility exercises to improve their range of motion and posture to make them better and safer CrossFit athletes. From the beginning student who has never even performed an air squat to an advanced athlete, becoming more flexible, mobile, and stable and in better alignment will improve any athletes’ performance and dramatically reduce the chances of having an injury because of improper positioning in a lift or movement. This is Sean’s main concern and also his passion when working with athletes.

Dr. Kim McGrath

Nutrition Coach


Kim spent nearly two decades as a leader in global corporate business development and marketing in high-tech firms. Between heavy travel, deadlines, and spending time with family, she found it extremely challenging to find the time to eat healthy and exercise. After being fed up with being overweight and stressed out by repeated failures with popular “diet” programs, leveraging her technical background she educated herself in the science of nutrition and transformed her lifestyle. Now, she is passionate about helping others achieve the same success. Her clients range from those looking to adopt healthier habits and lose weight to advanced athletes seeking optimization. With an intimate coaching style that combines customized programs with mindset development, Kim’s clients have a high long term success rate.

Kim loves CrossFit, trail running, and has completed some of the most elite multi-day tactical endurance events across the country – through this training, she has developed the mental toughness and growth mindset habits which she directly applies into her nutrition coaching.

Kim is a Sport Nutrition coach certified by the International Society of Sports Nutrition (CISSN), has a PhD in Chemistry from the University of Southern California, and an MBA from UC Irvine.