Mainstay Performance Team

Allie Jackson

Allie brings over 10 years of experience in the health and fitness industry. Prior to Mainstay, she served as a Health and Fitness Specialist training with members of the U.S. House of Representatives. Throughout her career, she has trained a variety of high-powered individuals, including executives, congress members, and other busy professionals. Her goal is to help them optimize their professional performance through health and fitness. She brings a wealth of knowledge and experience to her work, and she is dedicated to helping her clients reach their goals, both inside and outside of the gym.

  • M.S. Exercise Science and Health Promotion

  • Master Health Coach (NBHWC Board Ceritifed Health Coach 2024)

  • Certified Personal Trainer

  • Certified Nutrition Coach

  • Certified Pre- & Postnatal Coach

  • Registered Yoga Teacher

Harrison Marick

As a collegiate athlete, Harrison began his health and wellness journey in pursuit of an edge over his competition. The habits he developed during his time as an athlete carried over into his professional life. Today, Harrison is an executive for a multi-million dollar consulting firm and practices Mainstay’s principles to optimize his professional performance. In addition to his executive experience, Harrison brings several years of personal training and group training experience to the table. He is eager to share the learnings and principles he has honed with Allie throughout his business career.

  • B.A. in Mathematics and Statistics

  • Lead Data Scientist at Tiber Solutions

  • Former Collegiate Athlete

  • Certified Strength and Conditioning Specialist (2020-2023)

  • CrossFit Level 1 Certified (2017-2022)