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J King Performance

$200/session
Estimated price


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It’s free, with no obligation to book


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If you hire this pro, you’re covered by a money-back guarantee. Learn more

About
Ready to learn how to defend yourself? Whether your goal is to lose weight, gain muscle, boost your fitness or become healthier—I’ll help get you there. Now sitting at 6'5" and 225 lbs, I’ve been the skinniest guy in the room, the chunky guy and the least equipped to defend himself at different times in my life. At 34 years old I now have a 10-0 fight record, over 10 years of experience in Muay Thai, Strength & Conditioning Training and Fitness. I design tailor-made plans for each individual geared towards multiple goals: - Traditional Muay Thai, Boxing and Self-Defense - Weightloss - Muscle Gain - Strength and Fitness NOW OFFERING WEEKLY CLASSES – ASK FOR DETAILS Whether you’re just starting out or looking to level up, our Muay Thai classes are designed to be accessible for all budgets. We believe everyone should have the chance to train, grow, and feel confident—without breaking the bank. Private group sessions are also available, and I offer customized Muay Thai camps for companies, schools, or teams. As your coach, I’ll guide you through every step—building your ideal body, improving your fighting ability, and boosting your confidence. We focus on one habit at a time so progress feels natural and lasting. NASM Certified Personal Trainer 10-0 Fight Record | National, State & World Classic Champion Shoot me a message to book a half-priced intro private session to see if we're the right fit.
Overview

Hired 28 times

Serves San Francisco, CA

Background checked

2 employees

10 years in business

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This pro accepts payments via Apple Pay, Cash, Venmo, and Zelle.

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I travel to my customers

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Reviews

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

Exceptional 5.0

51 reviews

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Senzeyu Z.

Oct 9, 2025

Hired on Thumbtack

I’ve trained with Jack for a while now, and what really stands out is how personalized his coaching is. Every session is thoughtfully tailored — he quickly picks up on your strengths, weaknesses, and learning style, and adjusts his teaching to help you improve efficiently. Whether it’s refining technique, building conditioning, or sharpening fight IQ, his attention to detail makes a huge difference. You can tell he genuinely cares about helping each student grow, no matter their level. Highly recommend training with him if you want focused, high-quality instruction.
Private Self Defense Lessons
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Brittany R.

May 19, 2025

Hired on Thumbtack

I’ve been working out with Jack for some time now and I’ve learned quite a bit. My technique has improved significantly. I feel like my sessions are always customized and he’s always prepared. They’ve definitely progressed over time and a lot of the combinations became more natural with repetition. I’ve also started to figure out which areas I need to improve in my mobility to aide in my training from the critiques mid-session in addition to accountability that has helped my weight loss. I’ve learned skills that I do find valuable for self-defense. I find that his training is repeatable when you want to self train between sessions. I’ve definitely progressed and gained confidence over the last six months that we’ve trained together and I would highly recommend him. I think that Jack trains is not just as a fighter / trainer but as a friend and I’ve learned a lot of mental techniques as well that have help beyond just Muay Thai, which I have significantly enjoyed.
Private Self Defense Lessons
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Amanda S.

Apr 6, 2025

Hired on Thumbtack

Training with Coach Jack for the past three months has truly changed my life. He creates such a safe, supportive environment that makes you feel empowered every step of the way. I’m so grateful to be learning from someone who brings so much heart to the job. I’m also now attending the class he teaches, Coach Jack’s class has been a great opportunity to join a community and learn alongside with others. His patience and encouragement with the class is genuine motivating.
Private Self Defense Lessons
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Hazar Y.

Jan 5, 2025

Hired on Thumbtack

Training with Coach Jack has been an incredible experience! His ability to explain techniques clearly and tailor his coaching to my skill level has helped me improve so much. He’s supportive, motivating, and always pushes me to do my best. Every session is challenging, but I leave feeling stronger and more confident. If you’re serious about Muay Thai, I can’t recommend Jack enough!
Private Self Defense Lessons
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Andres O.

Aug 22, 2020

Hired on Thumbtack

Hi all - I have been training different martial arts for 7+ years. And, Jack is by far the best coach I've ever had. For starters, Jack is incredibly passionate about coaching - that's what he wants to dedicate his life to. This shows in the passion with which he approaches coaching sessions as he studies, prepares for sessions, and comes to each session with an individually-tailored plan that allows you to progress towards your objectives very rapidly. Jack's approach to fitness is also unique because of his competitive Muay Thai background. He not only focuses on aesthetics but also on holistic fitness that could serve an advanced martial arts practitioner in any situation. Lastly (and probably most importantly), most of the value that you get from training with Jack comes from his desire to coach the mind as well as the body. He really cares for you during the training sessions and uses Muay Thai and Fitness as tools to help you develop your mind in a healthy way - he's a great listener and legitimately cares about your well-being, confidence, health, and happiness. If you're thinking of working with any trainer in the Bay Area, don't hesitate: choose Jack. And, if you're still dubious, feel free to reach out to me. I'm happy to provide a reference via the phone. Andres
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Jack Kerr