Dennis Marshall

Dennis is Co-Owner and Head Coach here at CFGC. He has dedicated the past 14 years of his life to helping people improve their health, their performance and the quality of their lives through strength & conditioning and better nutrition & lifestyle habits.

Since 2008, Dennis has had the pleasure of working with the CrossFit Level 1 Course Staff, traveling around the world sharing the CrossFit training methodology and philosophy with thousands. He also works as a member of the CrossFit Level 2 Course staff, helping other trainers improve their coaching and programming skills.

His vision for CrossFit Garden City is a community of healthy, happy, strong people who support one another to get better every day…in the gym, in sport, and in life.


  • CrossFit HQ Staff Trainer
  • CrossFit Level 4 Trainer
  • CrossFit Olympic Weightlifting, Powerlifting, Gymnastics, Mobility, Aerobic Capacity
  • Poliquin Institute - P.I.C.P. Level 3
  • NSCA - Certified Strength & Conditioning Specialist
  • USA Weightlifting - Club Coach
  • CHEK Institute - Exercise Coach
  • CHEK Institute - Holistic Lifestyle Coach
  • M.S. Exercise Science: Performance Enhancement
  • B.A. Economics - Wesleyan University
  • Team Member - 2014 CrossFit Games Northeast Regional Qualifiers - 9th Place 

Email Dennis: dennis@crossfitgardencity.com