Serin Fitness

$60

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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

Serves Holtsville, NY

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.

Social media

Instagram

Services offered

Event to prep for

Fitness goals

Lose weight

Get toned

Build muscle

Gain flexibility

Client age

41 - 50 years old

51 - 60 years old

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:

Michael B.

Oct 2, 2016

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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

Jaime D.

Jun 18, 2020

Nick D.

Oct 2, 2016

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