Dr Kaz Williams

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Dr Kaz Williams, Performance Psychologist, Certified Running Coach, Speaker, Ultra runner.

Kaz is the Head Coach at Mettle, works with athletes on their mental game and delivers expert, interactive and energizing talks making her a favorite speaker with athletes and business leaders.

Kaz also shares lessons from racing ultramarathons and her podium finishes at Tahoe 200, Moab 240 and Tot Dret, Italy. She has also won Ouray 100-mile endurance race in Colorado.

Failing to finish a race became one of her greatest lessons.

Kaz quit an ultramarathon because she had convinced herself she wasn’t physically capable of finishing.

The minute her race number was cut, ending her race, she knew it was her mental game that had failed her. Reflecting on this experience helped her develop tools to deliver more positive race results. 

With her evidence-based practice, PhD in human behavior, Masters in Sport and Exercise Psychology, Kaz has studied our power to perform to the very best of our ability when in stressful situations or when faced with adversity. 

Along with her certified coaching skills, training and racing experience, Kaz produces scientifically and rationally designed training programs and mental toughness plans, specifically adapted to her athlete’s fitness level, running aspirations and life.


Wherever you are in the world, I can help you successfully train towards your goals, boost your mental strength, and inspire you to be the best trail and ultra runner you can be.

– DR Kaz Williams


Kaz coaches runners from all over the world and of all ages and abilities, from new runners to master athletes.

She has a unique ability to understand the demands of life and the needs of her athletes, creating training programs and mental strategies to inspire, support and educate her athletes to dream big, find their mettle and go after their running goals.

We can all benefit from coaching, whether it’s to build confidence, get motivated, overcome a problem or enhance our performance.

– DR Kaz Williams

Kaz is on a mission to help you believe in you. To motivate and empower you to become the best version of you. 

She speaks to audiences around the world providing practical skills and strategies that can be used straight away, making her talks a memorable, educational experience.

Racing highlights

  • 3rd female, Tahoe 200, California, 2017
  • 1 loop at The Barkley Marathons, Tennessee, 2018
  • 2nd female, Moab 240, Utah, 2018
  • 1st female, Ouray 100 Mile Race, Colorado, 2019
  • 3rd female, TOR Tot Dret 130, Italy, 2019
  • 3rd female, Across the Years 10 days, 420 miles, 2022
  • Badwater Salton Sea, California, 2023
  • Last Annual Vol State 500K screwed (self-supported), Tennessee, 2023

Kaz is thrilled to have been invited to race Badwater 135 in 2024.

Kaz having just finished Tot Dret, TOR finish line and finding out she came 3rd woman.
The Barkley Marathons Laz is behind a desk with a list of runners and Dr Pepper drinks and presents Kaz with bib number 1
Kaz at aid station in Moab 240 enjoying amazing real food.
Kaz had just finished Moab 240 and Howie Stern captures this emotional moment.


  • PhD An Ethnographic Study of Culture  
  • MSc Sports and Exercise Psychology
  • UESCA Certified Running Coach
  • Physical Training Instructor (PTI) in the British Army Reserve Forces


Trail Running Women | December 2023

Dr Kaz Williams on our power to perform when faced with adversity. 


Running44@60  | #134

Dr Kaz Williams on how to plan and deal with the mental side of running.