Client Testimonials


I just want you to know that I thank my lucky stars that I met you. You are a very special person who knows how to work with those who work for you as well as your clients. I watch you with people like Larry with his vertigo, the man who broke his back some huge mountain, and the man with one arm. I see how kind and encouraging you are with others and me. I know how hard you work to help me do better, and how we have created a warm relationship that means so much to me. I hope we can work together for years to come!

Thank you from the bottom of my heart for being you!!

Strength for Life
Bonnie – West Palm Beach, Florida

Dear Jim,

I can’t thank you enough for all you have done for me this past summer. Really, you saved my life.  I am much stronger and healthier.  I can move again, without pain. I’m so appreciative.  Thank you for the care and time you put into my rehabilitation. You are a wonder and genius. You are my “movement guru”.

I look forward to working with you again when I return in the spring.

Strength For Life

Lou M – Southampton, NY

Kerry Sharkey

Core Dynamics member Kerry Sharkey-Miller is a Sag Harbor-based photographer with an extensive background in fine art and media production.

When I was in my thirties, I owned and operated an art gallery and I worked out regularly before going to work. In those days I was in pretty good shape. In my 40’s I was teaching media arts full-time, and was spending less and less time working out. I spent long hours sitting at a desk working on a computer, and developed some pretty bad dysfunctional movement patterns with chronic muscle spasms in my back, neck and hands. At this point my workouts consisted mainly of cardio training on the elliptical machine. I was having a lot of trouble getting my chronic spasms under control and wasn’t able to do much else. The spasms also started to prevent me from being able to work for any extended amount of time.

For a while I saw a physical therapist, until my insurance company cut me off. It was at that point, about a year and a half ago, that I approached Jim O’Hagan for help.

In the beginning, I was so weak in my neck, back and core that I couldn’t even lift my head off the table. Jim put me through a sequence of mobility tests to identify which muscles needed strengthening. Then he prescribed a corrective series of exercises–a routine I could run through at home, three times a day until I was able to strengthen the muscles enough to begin a strength training program. I worked with Jim on a weekly basis in the beginning. Within a few months, my spasms had calmed down considerably, I lost twelve pounds, my strength and mobility had really improved, and that was just from the corrective exercise routine

Now I try to get to the gym four or five times a week. Many of the corrective exercises and drills now serve my warmup routine. Jim put together strength training routine for me the consists of exercises that work groups of muscles together, in natural movement patterns, rather than isolating individual muscles for conditioning. Some of the exercises in my routine include dead lifts, squats, pistol squats, push-ups, weighted hip-hinge, and handstand push-ups.

Having never worked with a trainer before, I had no idea how valuable having someone watch and evaluate you can be. The smallest corrections in how to perform an exercise make a huge difference, and having a workout tailored to address my specific needs yields incredible results.

I am able to work out on my own with the knowledge I gained from the training sessions. I still need coaching from time to time be sure I am performing the exercises correctly, and to add additional challenges to my routine. Occasionally the spasms will return but I am usually able to get them back under control with some coaching from Jim. Clearly, it’s a work-in-progress, but the incredible improvements in strength and mobility I’ve experienced are a very strong incentive to stick with it.

Prior to working with Jim I had resigned myself to the belief that my age was beginning to limit my physical abilities. I couldn’t have been more wrong! At 57 I am stronger and in much better shape than I was at 40, and I feel like I am just getting started!

Amazing Results!!
To Core Dynamics and all that it may benefit:

James Vacey Before

James Vacey Before 2My wife and I have been loyal Core Dynamic customers for the last seven years. Recently I made the commitment to obtain my business degree, so I neglected the gym and focused upon my studies. I went without the gym for roughly a year and a half and subsequently gaining more weight and becoming very unhealthy.

In January of 2015 I took the Biggest Loser Challenge and due to my new job hours I failed miserably and gained even more weight. When I reached the weight of 240 pounds I had decided this was enougJames Vacey Afterh. I recruited the help of an “Amazing Trainer” Craig Priestly and the Nutritionist John Erickson.

When I came back from my vacation in late March I started on my journey to shed the weight and in 3 months. I have shed over 30 pounds. I am attempting to reach my goal of 40 pounds as I am typing this letter.

The staff Core Dynamics have been very supportive, with well wishes from all of them along with my wife, but the motivation of my friend and trainer Craig have help me tremendously and the suggestions and dietary advice of John have put me in a healthier and better place physically and mentally. Thank You All.

James A. Vacey