About

Dr. Arianne Missimer and Brock Butler

The Runner's Toolkit Team

We joined forces to create the best possible educational resource for runners based on the many runners we've worked with who face the same challenges and strive for the same goals.


This site blends the strength, movement, biomechanics, physical therapy, and nutritional expertise from Dr. Arianne with Brock's experience coaching runners and competing as an elite athlete.
Brock Butler
Brock Butler
Co-Creator, Elite Runner, Coach
Brock Butler Brock is an athletic coach and elite competitor who focuses on running events from 1-mile track races up to 100-mile ultramarathons. He won the 40+ masters division at the Philadelphia Marathon in 2017, the Blues Cruise 50K Trail Ultra race the same year, and the USATF Masters 3000m Indoor nationals and Cherry Blossom
Dr. Arianne Missimer
Dr. Arianne Missimer
Co-Creator, Physiology & Nutritional Expert
Dr. Arianne Missimer Dr. Arianne Missimer, Doctor of Physical Therapy, Registered Dietitian, and Human Movement Specialist, has spent the past 20 years in the fitness and nutrition industry. Dr. Missimer is the owner and founder of The Movement Paradigm” (www. themovementparadigm.com) where she shares her passion for an integrative approach with professionals and the community.