Meet the Coaches

Our coaches help people of all different fitness levels. We train to enjoy life’s outdoor adventures as well as to get fit & live healthy lifestyles.

Jan Bevc Denny - CrossFit L1 L2 Coach Programming Scaling, Judges Course USAW - Gym Owner

Gym Owner - Coach

Jan Denny

Jan has been an athlete all his life, starting when he was about 8 years old with swimming. He was born and raised in Slovenia and always had a dream of moving to the United States to study and swim. 7 years ago he got his opportunity and moved to San Francisco to study hospitality. While he was studying and working as a manager at the Hyatt, Crossfit was his favorite part of the day.


He found CrossFit as an athlete and trained at San Francisco CrossFit for 3 years. He always tried helping other members in class which was noted by coaches and he was offered an internship at that gym. After coaching in San Francisco he moved to Denver 2 years ago. Here in this beautiful city he has coached in a couple of local gyms, while always wanting to have his own gym.

  • CrossFit Level 1
  • CrossFit Level 2
  • CrossFit Spot The Flaw
  • CrossFit Judges Course
  • CrossFit Programming
  • CrossFit Scaling
  • USAW Level 1
  • 2021 Windsor Warrior, 1st Place Co-Ed
  • 2020 Battle at The Rock, 1st Place Open Division
  • 2018 Pound for Pound, 1st Place Open
  • 2018 Oakland A's CrossFit Day, 2nd Place team
  • 2018 Lion's Den Summer Throwdown, 1st Place - partners
  • 2018 Festivus Games, 2nd Place
Griffin Zigrang - CrossFit Coach - Nutrition Coach New Member Coordinator

CrossFit Coach

Griffin Zigrang

Griffin was introduced to CrossFit in 2011 when she stumbled upon and started doing the WODs at her local globo gym. She was immediately hooked. After moving to CO in 2014 she joined her first affiliate at CrossFit Ken Caryl, and a few months later, found her place at CrossFit 720.

Griffin was a gymnast from the time she could toddle until she was a 14-year old Level 9/10. She was forced to quit due to scoliosis and the inevitable, spinal fusion surgery. After surgery, she moved on to power tumbling, competitive cheerleading, and competitive dance, but gymnastics was a passion that, years later, she still hasn't gotten over. You will see evidence of this in her classes as she focuses on movement, proper body positions, and strict strength.

Pre-CrossFit, Griffin earned her Bachelor of Science in Psychology from Longwood University and Master of Art in Organizational Behavior and Program Evaluation from Claremont Graduate University. She did program evaluation work in the public sector, both at the federal and local levels, for six years before acknowledging that the fitness world was where she needed to be.

  • CrossFit Level 1
  • NCI Nutrition Coaching Specialist, Level 1
  • i99 Gymnastics Coach Certification 
  • CrossFit Gymnastics
  • CrossFit Kids
  • USA Weightlifting Level 1 Sports Performance
  • Training Think Tank – Energy & Strength Systems
  • BS in Psychology
  • MA in Organizational Behavior and Program Evaluation

CrossFit Coach

Kathleen Sigg

Kathleen found CrossFit in 2016 after tiring of self-directed globo gym lifting. Since then she never looked back and fell in love with the community support and empowerment CrossFit gave her. She began her coaching career in Pittsburgh in 2019 after recognizing the joy she felt in seeing others get better and succeed. 
In 2021 she moved to Colorado and was delighted to have the opportunity to continue sharing her passion for fitness with the 720 Athletics community as a coach. She has a particular affinity for learning and teaching the techniques of the Olympic Lifts.”


  • CrossFit Level 1
  • USAW Level 1
Justin Biays Crossfit 720 Coach Denver, CO

Olympic Lifting/Fitness Coach

Justin Biays

Justin is a combat veteran serving four years as an 11B (Infantry). After leaving the Army in 2013 he pursued a career as a full time Strength and Conditioning coach, earning his Bachelor's and Master’s degree in Exercise Science.

Justin Found his love for fitness in 2011 while deployed in Afghanistan, and has dedicated his life to helping others achieve their athletic goals. He has a strong interest in developing Strength and Conditioning programs geared towards improving performance in all areas of fitness while reducing and mitigating injury.

  • CSCS- Certified Strength and Conditioning Specialist (NSCA)
  • TSAC-F- Tactical Strength and Conditioning Facilitator (NSCA)
  • USAW- SP
  • NASM-Certified Personal Trainer NASM-Performance Enhancement Specialist
  • CrossFit Level 1
  • CrossFit Specialty Course- Conjugate Methods
  • OPEX CCP- Program design
  • OPEX CCP- Assessment
  • OPEX CCP- Nutrition
  • EMR- Emergency Medical Responder


Bachelor of Science, Exercise Science, Minor: Sports Nutrition

Masters of Applied Exercise Science, Human Movement


  • 2016 Regional athlete, Team CrossFit 720
  • Turkey Challenge Pro Division 2015, 2016, 2017, 2018
  • International Functional Fitness League team qualifier 2017


Savannah Fearns crossfit coach denver

Olympic Lifting/Fitness Coach

Savannah Fearns

Savannah found CrossFit in 2012 while attempting to shake off some weight. Having grown up playing soccer, swimming, snowboarding and being raised in the military, physical activity has always been a necessity. But even after joining the military herself, she still managed to fall into a funk. She dropped the weight, yet felt weak until she found a group of CrossFit inspired friends at the base gym. This gave her a new respect for strength and weight gain and from there she took it by storm. Realizing the liberating effect the iron therapy had on her life and many others, she proceeded to get her Level 1 in 2014 and could only hope to share the same joy that she’s had with her new found health.
Since then she has coached at 5 gyms over 2 states and regularly entered CrossFit and Weightlifting competitions. 
Her favorite lifts are the Snatch and the Deadlift; she has placed 2nd at the Colorado State Weightlifting Meet in the 69kg class. 
  • CrossFit Level 1
  • CrossFit Level 2
  • i99 Gymnastics Coach Certification
  • CrossFit Rowing
  • CrossFit Weightlifting 
  • CrossFit Anatomy
  • CrossFit Scaling
  • CPR AED 
  •  2nd Place Colorado State Weightlifting Meet - 69kg class