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J King Performance

$200
Estimated price


Training location

Responds in about 3 hours


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About
I’m Jack - Champion Muay Thai fighter, coach and personal trainer based in Pacific Heights San Francisco. As an 11-0 4x National Champion with substantial time spent in Thailand, I’ve been through it all when it comes to weightloss, strength & conditioning, fight skill and mental fortification. At 6’5” and 225 lbs, I’ve been the skinny guy in the room, the overweight guy, and someone who lacked confidence. I know what it’s like to start from scratch—which is why I compassionately coach real people with real lives, working together to ensure championship level success at a pace that makes sense for each individual. I offer everything I’ve learned over the past 20 years to high achievers in San Francisco tailored to their individual goals including: 🌴Weight loss & Body Transformation 🌴Strength & Muscle Building 🌴Muay Thai for Self Defense & Confidence 🌴Muay Thai for Competition (J King Performance Fight Team: 4-0) 🌴Stress reduction & Mental Resilience 🌴Mobility, Recovery & Performance I offer: • Private 1-on-1 coaching • Small group training • Corporate wellness & team-building Muay Thai workshops • School Muay Thai camps • Annual Muay Thai retreats in beautiful Sonoma County for long-term clients My coaching isn’t about quick fixes or punishment. It’s about building a body you’re proud of, developing confidence that carries into everyday life, and creating habits that actually stick. Whether you’re walking into a gym for the first time or looking to sharpen your skills, I’ll meet you where you are and help you become the strongest version of yourself. Client Results ⭐ Helped an executive lose over 60 lbs while dramatically improving confidence, energy, and health markers. ⭐ Coached teenagers from being bullied and lacking confidence to competing, sparring, and becoming leaders in the gym. ⭐ Helped busy professionals finally build a sustainable fitness routine that fits demanding careers. ⭐ Guided students of all ages to improve discipline, fitness, self-confidence, and overall quality of life. If you’re ready to build confidence, get in the best shape of your life, and learn skills that last forever, send me a message. 📩 Book your half-price introductory session today
Overview

Hired 34 times

Serves San Francisco, CA

Background checked

1 employee

11 years in business

Business hours

This pro hasn't listed their business hours.

Payment methods

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

Social media

Instagram

Services offered
Event to prep for
Fitness goals

Lose weight

Get toned

Build muscle

Gain flexibility

Client age

18 - 22 years old

23 - 30 years old

31 - 40 years old

41 - 50 years old

Projects and media
Projects and media
Reviews

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

Exceptional 5.0

55 reviews

5

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Read reviews that mention:


pro avatar
Saul C.

3 weeks ago

Hired on Thumbtack

Jack is a great trainer, he has been doing strength and Muay Thai training and has been very patient and knowledgable. He has helped me gain confidence to be able to go to the gym. I cannot recommend him enough!
Private Self Defense Lessons
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Ilian H.

2 weeks ago

Hired on Thumbtack

Embodies an amazing work ethic, is super professional, always responsive always on time. Jack's an amazing sensei and also an incredible human. Genuinely cares about my personal well-being & growth, consistently challenges me to improve, and personally created a fighting regiment tailored to my specific fighting style. He's been coaching me for more than a year and I'm looking forward to our lessons for many years to come.
Private Self Defense Lessons
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Alexas W.

3 weeks ago

Hired on Thumbtack

Personal Training
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Bob A.

3 weeks ago

Hired on Thumbtack

Jack was excellent. He was fun and professional. I had a great time working with him. I actually came from a boxing background but he quickly adjusted my technique and I had a blast.
Private Self Defense Lessons
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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
Credentials
Background Check

Jack Kerr