David NickumOwner / Personal Trainer

David S. Nickum is an inspirational fitness professional with over 13 years in the health and wellness industry. What he brings to any workout program is a deep understanding of anatomy, nutrition, and exercise physiology. His programs are unique, innovative, educational, and customized to get the job done quickly. He is a cutting edge professional who builds a program that fits your individualized goals.

Starting out in the field of automotive technology industry, David had a lot of problems with pain in the lower back. This led him to the world of health and wellness. David was tired of getting prescribed pills to address his problems and he knew that physical therapy would only be a short-term fix, so he decided to learn about the human body to fix the problem on his own.

Throughout his career, David has developed a deep understanding about the human body. He started out only knowing the basics. Seven years later he has become a leader in the field of fitness, he designed his own style of training which works on posture, metabolism, pain management, and performance.

David has a background in massage, working with seniors, children and people trying to lose weight. Recently David has become certified as a running coach and has run 8 marathons including the Boston marathon 2 times.

Dan O'ConnorPersonal Trainer

Dan has over 12 years experience as a personal trainer. He has been fortunate enough to work with a very wide range of clients during that time. Building fitness programs for clients from elite athlete’s to those with profound disabilities and every level of fitness in between. Dan’s clients find my workouts to be creative, innovative, extremely effective, and enjoyable. In addition to personal training experience, Dan has 22 years experience as Physical Education/Adapted Physical Education/Health Teacher this experience allows him the ability to assess his clients fitness needs efficiently and instruct in a effective manner that results in accomplished fitness goals and a improved quality of life through proper diet and exercise.

Peter LeePersonal Trainer

Peter is a CSCS certified strength and conditioning coach born and raised in the Northern Virginia area. He has trained athletes of all skill levels as well as the general population during his time working in different gyms such as Performance Edge and Sport and Health, specializing in speed and strength training, weight loss, and metabolic conditioning. While playing football and lacrosse in high school, Peter understood at an early age that in order to be reach your goals and be successful, you have to put in the work with dedication and commitment. He wishes to instill that concept to all of this clients not only in the weight room but in life general.

Karin Collins Personal Trainer

Karin Collins joined OntheGoFitness locally from Alexandria, VA with a diploma in Fitness and Nutrition from the National Personal Training Institute, certification in NASM and a Bachelor’s Degree in Communication and Spanish from the University of Arizona. Karin is passionate about pushing others to become the best version of themselves. Her high attention to detail and goal setting brings continued success for her clients. She is a huge believer that the secret to success in any area of life (especially health and fitness) is in a consistent routine and the habits you perform every day. Her mission is to increase the health span of as many people possible. In her free time, she enjoys weightlifting, reading, practicing gymnastics, playing tennis and swimming.