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About
💥 Struggling with pain, weight gain, or low energy? You’re not alone — but you don’t have to figure it out alone, either.
With over 18 years of experience, I help adults move better, feel stronger, and build the confidence to reclaim their health — whether in-person or virtually.
🎯 My specialties include:
✅ Mobility & Movement Optimization
✅ Weight Loss & Sustainable Nutrition Coaching
✅ Functional Strength for Everyday Life
✅ Accountability & Lifestyle Support
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Choose the coaching experience that fits your life:
🔹 Virtual Fitness & Nutrition Coaching
Personalized workouts, expert nutrition guidance, and daily check-ins — all done remotely. Perfect for busy parents, professionals, or anyone ready to take control of their health on their terms. No gym required.
🔹 In-Home Personal Training (Local Only)
Private, customized training sessions delivered right to your door. Ideal for those who want hands-on support, proper form guidance, and real-time motivation — all in the comfort of their home.
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🏢 Exercise Physiologist — Brookhaven National Laboratory
🎓 B.S. in Health Science — Stony Brook University
🧠 18+ Years Personal Training Experience | Evidence-Based, Results-Driven
Certifications👇🏼
NASM: CPT, CES, WLS, PES, and VCS
Precision Nutrition: Level 1 Nutrition Coach
Overview
Hired 7 times
Background checked
1 employee
19 years in business
Business hours
This pro hasn't listed their business hours.
Payment methods
This pro accepts payments via Cash, Check, and Zelle.
Customers rated this pro highly for professionalism, work quality, and responsiveness.
Excellent 4.9
18 reviews
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94%
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Read reviews that mention:
Michael B.
Oct 2, 2016
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Hired on Thumbtack
I worked with Keith for quite awhile and throughout my experience he was a really nice guy, and knew exactly what he was doing all of the time. He gives really thorough explanations so you are always aware which muscle he is working on and how this excercise improves and strengthens that. Training with Keith is an incredible experience and it helps to keep me in shape and even become faster and stronger. I couldn't have asked for a better personal trainer all around, and a nice guy to work with. He can do everything such as strengthen muscles, improve your speed and keep you in shape! I highly recommend working with Keith if you are looking for an intelligent, committed personal trainer!
Personal Training
Mariella R.
Nov 20, 2014
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Hired on Thumbtack
Working with Keith has been great. He explains everything so well and makes sure my form is always correct. He always lets me know which part of my body I am working out during each exercise. He's professional, friendly, and even follows up with encouraging texts after some workouts. I highly recommend Keith to anyone looking for a great trainer who does his job and makes you sweat and sore after every workout!
Personal Training
Alex M.
Nov 17, 2014
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Hired on Thumbtack
ever since I started training with Keith I have seen results immediately. he has done a great job working with me and helping me improve on things that I asked him to help me get better with. he focuses in on certain things that you want to work on and comes up with special workouts designed to get you better at what you want. I always look forward to going to workout because I know Keith will push to my limit and that's what will make you better. I would recommend Keith to anyone who wants to increase their speed strength or overall fitness because he is a great motivator and gives you what you need for you to succeed.
Personal Training
Konstantin D.
Aug 17, 2019
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Hired on Thumbtack
I had a great experience with Keith. He was always on time and very attentive while being down-to-earth and relatable. He’s very knowledgable and has put a significant effort into tailoring my workout regime, always adding something creative and fun to each workout. Our sessions were challenging, but I always felt encouraged by Keith to push myself harder, and I genuinely enjoyed my workouts. He paid careful attention to my form to ensure I’m effective and taught me the importance of stretching. My energy level and self-confidence have benefited tremendously. Keith went above and beyond my expectations, and I would definitely recommend him to anyone looking to improve themselves.
Personal Training
Gail H.
Jun 15, 2014
Keith is an excellent trainer who takes the time and effort to help you learn how to properly work out. I have been going to the gym for years, but have just learned how to properly use the equipment. Keith has also taught me core and strength exercises that I would not otherwise have done. I highly recommend Kieth as a trainer.
Credentials
Background Check
Keith Serin
FAQs
What should the customer know about your pricing (e.g., discounts, fees)?
Virtual Fitness and Nutrition Coaching packages: 1 month, 3 months, and 6 months. The price per month decreases with package size.
In-home pt rates vary on the distance I have to travel. Other variables affecting the rate include the length of the session; either 30-minute or full hour; and whether the session is 1-on-1, 2-on-1, or a small group. Discounts are given based on the number of sessions that are prepaid. Additionally, nutrition coaching services are a separate fee.
What is your typical process for working with a new customer?
It begins with a detailed phone discussion of the client's fitness experience, health status, dietary preferences, and goals. Thereafter, we schedule an appointment for a comprehensive fitness assessment that encompasses cardiovascular fitness, strength, and mobility. This enables me to put together a safe and effective exercise program design. The first workout making use of the program will take place during the second appointment.
What education and/or training do you have that relates to your work?
18 years of Personal Training Experience
Bachelor of Science in Health Science
Anatomy & Physiology 1 and 2
NASM: Certified Personal Trainer
NASM: Corrective Exercise Specialist
NASM: Performance Enhancement Specialist
NASM: Virtual Coaching Specialist
Precision Nutrition: Level 1, Exercise Nutrition
