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Serin Fitness

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Goals
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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 ⸻ 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. ⸻ 🏢 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.

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Services offered

Work location

My customers travel to me

I travel to my customers

Projects and media
Projects and media
Reviews

Customers rated this pro highly for professionalism, work quality, and responsiveness.

Excellent 4.9

18 reviews

5

94%

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Mariella R.

Nov 20, 2014

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
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Nick D.

Oct 2, 2016

Keith is a fantastic trainer who really knows what he is doing. Aside from being a trainer, he also gets to know the person he is training very well. Overall, I would definitely recommend Keith to anyone looking for a personal trainer.
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Konstantin D.

Aug 17, 2019

Hired on Thumbtack

Personal Training
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Alex M.

Nov 17, 2014

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
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Michael B.

Oct 2, 2016

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
Credentials
Background Check

Keith Serin