Meet The Team

With over 14 years of experience in the fitness and human performance industry, Jeff Lewis brings a deep, science-driven approach to training, coaching, and leadership. His background spans corporate fitness, strength and conditioning, physical therapy, and boutique personal training environments, giving him a uniquely well-rounded perspective on how to train individuals safely, effectively, and for long-term results.

Jeff has worked with an exceptionally wide range of clients—from youth athletes as young as 8 years old to older adults in their 80s, as well as collegiate and professional athletes across sports including football, soccer, basketball, baseball, hockey, and judo. This breadth of experience has shaped his ability to tailor training to each individual, regardless of age, ability, or background.

While Jeff is passionate about helping people achieve tangible results such as fat loss, muscle gain, and strength development, his greatest focus lies in functional fitness, injury rehabilitation, and athletic performance enhancement. He specializes in improving how people move, perform, and feel—bridging the gap between rehabilitation and high-level performance through intelligent, intentional programming.

A strong advocate for education and evidence-based practice, Jeff serves on the Exercise Science Advisory Board at Metropolitan State University of Denver, where he helps guide curriculum development and prepare the next generation of fitness professionals. His approach to coaching is rooted in biomechanics, movement quality, and sustainable progression—ensuring results that last beyond the gym.

At Proper Fitness, Jeff’s mission is simple: raise the standard of training by delivering individualized, purposeful coaching in an environment where both clients and coaches can thrive. His passion for movement, performance, and professional development is at the core of everything Proper Fitness represents.