Serin Fitness

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Introduction

💥 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

18 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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Instagram

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My customers travel to me

I travel to my customers

Projects and media

50 photos

Projects and media

50 photos

Reviews

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

Excellent 4.9

18 reviews

5

94%

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6%

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Read reviews that mention:

Mariella R.

Nov 20, 2014

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Hired on Thumbtack

Personal Training

Eythan M.

Jul 15, 2020

"My name is Eythan Maidhof. I’m a Cinematographer. This involves lifting heavy equipment during long work hours, usually 15-hour days. Exercise has been injury prevention since I've never had health insurance. I’ve trained with Keith on and off for eight-years. Now, I live in the lower East side of New York City and I still make a trip out to Suffolk County three-days a week to train with him. I really like his freestyle vibe of high interval intensity training. He’s very creative and resourceful. He's changed the way that I think about exercising since before I always thought it had to be done in a gym. While training with him over time I’ve learned the gym is nonessential for getting the results I want. To my surprise, I found that I got a better workout training with Keith outdoors than I did at the gym. His personal training sessions were very comprehensive and included anything from resistance training; speed, agility and quickness, cardio conditioning, balance training, and flexibility training. Those were all things I was lacking in my typical gym workouts. His personal training is very well designed and has progressed me far beyond my expectations each time I resumed training with him. Keith is easy to be around and doesn’t take himself too seriously for someone as experienced as he is. I have recommended Keith to anyone I know that would make the trip out to visit him from New York City and family members who live on Long Island. I could not speak highly enough of my friend and trainer Keith Serin". - Eythan Maidhof

Nick D.

Oct 2, 2016

Konstantin D.

Aug 17, 2019

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Hired on Thumbtack

Personal Training

Alex M.

Nov 17, 2014

·

Hired on Thumbtack

Personal Training

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