Diets don't work.

Behavior change does.

Greetings Friends!

I’m Colleen O’Brien, a Certified Personal Trainer and Registered Dietitian.

Nutrition is a science-based practice. Backed by sound nutritional research, I will help craft the perfect food plan for you!

Helping you create a personal fitness regime by tailoring fitness-training sessions specifically for you is my passion.

Everyone needs a personal regiment to achieve their goals.

My job is to help you create the program that will work for you to reach and sustain your lifestyle goals. Let me know what type of support you’re looking for and I’ll contact you to get more information.


Your Go-To Fitness & Nutrition Resource

Healthy Food

Summer Hydration Tips

Summer is here and there are so many great activities you can do to get your blood flowing but don’t forget to stay hydrated! Tips for staying hydrated this summer: Carry a reusable water bottle with you – it is cheaper than buying bottled water and it is eco-friendly! Add

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best diet colleen o'brien registered dietitian new york city
Healthy Food

What’s the Best Diet for Me?

There are so many diets out there – some touted for commercial interests, some sold as weight-loss plans, and many focused on treating diseases. Looking for the right nutrition plan can get confusing – if not downright complicated. If your doctors have diagnosed you as overweight or obese or with an illness

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Colleen O'Brien Nutrition & Fitness Blog
Healthy Fitness

HIIT – the Pros and Cons

If you read any of the fitness magazines I’m sure you’ll have heard of HIIT. Another popular name for this type of exercise training is Tabata. It’s one of the hottest trends in the fitness industry. HIIT stands for High Intensity Interval Training. You might wonder what makes HIIT different

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Everyone needs a plan.

Sounds simple, right? The bottom line is everyone needs a personal regimen to achieve their goals. My job is to help you create the program that will work for you to reach and sustain your lifestyle goals.  

Don't just take my word for it ...

"I met Colleen through my husband who was already working with her. I decided to work with Colleen and it was the best gift I could have given myself. She set me up with the proper workouts and nutrition I needed and I am happy to say I am back to myself. Grazie Colleen!"
Paola E.
"Colleen is a very knowledgeable, caring and nurturing professional. She combines her many years of being an elite fitness trainer, with her expert nutritional knowledge to customize highly effective programs for her clients. If you are ready for it, she will change your life."
Joe E.
"Colleen has been working with both of us for more than ten years. I can't imagine how we'd get along without her. We're well along in years, and she has provided just the right amount of challenge and encouragement for us in everything she does with our fitness training. Excellent trainer, but even more, a wonderful woman!"
Cliff and Adele A.