Jack Hacia
Golden Lane Sport & Fitness
London
7 votes
About
Qualifications
Specialisms
Location
Reviews
About
I’m Jacek Hacia, a London-based boxing coach and Level 3 Personal Trainer. I’ve spent years coaching clients of all ages and abilities — from complete beginners to people aged 70+ — helping them build strength, confidence, and fitness that lasts.
My background includes working alongside World, European, and Olympic Champions, which shaped my standards for technical detail, smart conditioning, and professional coaching. I specialise in boxing skills development, strength & conditioning, fat loss and body composition, and posture-focused training.
Whether your goal is to get leaner, move better, feel stronger, or prepare for White Collar Boxing or MTGP Amateurs, I’ll build a clear plan around your lifestyle and keep you progressing with structured sessions and accountability. My training is effective, safe, and never boring — with coaching that focuses on proper technique, measurable improvement, and long-term consistency.
You can train with me 1:1 or in classes across London.
My background includes working alongside World, European, and Olympic Champions, which shaped my standards for technical detail, smart conditioning, and professional coaching. I specialise in boxing skills development, strength & conditioning, fat loss and body composition, and posture-focused training.
Whether your goal is to get leaner, move better, feel stronger, or prepare for White Collar Boxing or MTGP Amateurs, I’ll build a clear plan around your lifestyle and keep you progressing with structured sessions and accountability. My training is effective, safe, and never boring — with coaching that focuses on proper technique, measurable improvement, and long-term consistency.
You can train with me 1:1 or in classes across London.
Qualifications
Level 3 Personal Trainer
CIMSPA Practitioner
HIIT Training
Strength & Conditioning Qualification
CIMSPA Practitioner
HIIT Training
Strength & Conditioning Qualification
Specialisms
Boxing Coaching
Strength & Conditioning
Weight Loss
Body Transformation
Sports Performance
Mobility
Posture Improvement
White Collar Boxing Prep
Strength & Conditioning
Weight Loss
Body Transformation
Sports Performance
Mobility
Posture Improvement
White Collar Boxing Prep
Location
7 Reviews
7 out of 7
I had a great experience training with Jack and would highly recommend him as a coach. He is very professional, knowledgeable, and extremely detail-oriented.
Jack helped me learn correct technique on key lifts such as deadlifts, squats, Bulgarian split squats, and more. He pays close attention to detail and is very precise in his coaching, making sure every movement is done properly and safely.
His programming is structured and clear, with training split across four main areas: technique, power, explosive work, and mobility/stretching. This quantitative and well-planned approach made progress easy to track and kept the sessions focused and effective.
The training I did with Jack contributed to strong results in regional and national judo competitions. If you’re looking for a coach who values correct technique, smart programming, and consistent progress, I would definitely recommend him.
Horia
Jack helped me learn correct technique on key lifts such as deadlifts, squats, Bulgarian split squats, and more. He pays close attention to detail and is very precise in his coaching, making sure every movement is done properly and safely.
His programming is structured and clear, with training split across four main areas: technique, power, explosive work, and mobility/stretching. This quantitative and well-planned approach made progress easy to track and kept the sessions focused and effective.
The training I did with Jack contributed to strong results in regional and national judo competitions. If you’re looking for a coach who values correct technique, smart programming, and consistent progress, I would definitely recommend him.
I've been training with Jack for both Boxing and strength training for around a year, and I could not be happier with the results. Both my boxing technique and fitness level have improved significantly during this time.
Jack is very experienced, and has a deep understanding and knowledge of both boxing and gym training. He helped me perfect my technique for key compound lifts such as squats, deadlifts, and bench press, and enabled and empowered me to start boxing from scratch improving my technique and my understanding of the sport continuously and quickly.
Jack's approach is methodical and structured, and he focused on correcting even small form mistakes and making me understand the rationale, allowing me to progress very fast, and without injuries. He's also very professional, attentive to details, and just a great person to be around.
I really recommend working with him!
Francesco D.
Jack is very experienced, and has a deep understanding and knowledge of both boxing and gym training. He helped me perfect my technique for key compound lifts such as squats, deadlifts, and bench press, and enabled and empowered me to start boxing from scratch improving my technique and my understanding of the sport continuously and quickly.
Jack's approach is methodical and structured, and he focused on correcting even small form mistakes and making me understand the rationale, allowing me to progress very fast, and without injuries. He's also very professional, attentive to details, and just a great person to be around.
I really recommend working with him!
I’ve been training with this coach for over a year and I couldn’t be happier with the results. My mobility has improved a lot, I’ve lost weight, and at the same time I’ve gotten noticeably stronger. He puts a huge emphasis on perfect technique, and I know what I’ve learned will stay with me long-term. Always professional, attentive, and genuinely committed to helping you progress. Highly recommended.
Iwona
I had the pleasure of training boxing under Jack tuition, and I can honestly say it has significantly improved my skills and overall understanding of the sport. Jack is not only an excellent boxer but also an outstanding fitness instructor.
The system he teaches is different from anything I’ve experienced before—and in this case, different means far better. His approach is structured, intelligent, and focused on real progression rather than shortcuts. Thanks to his guidance, my game has evolved, and I’ve seen clear improvements in my technique, movement, and confidence.
What truly sets Jack apart is his patience and dedication to detail. He takes the time to explain, correct, and refine even the smallest elements, which makes a huge difference in long-term development. He genuinely cares about his students’ progress.
The process takes time, but under Jack’s tuition, anyone who is willing to put in the work can expect real results. I highly recommend him to anyone serious about improving their boxing skills
Klaud
The system he teaches is different from anything I’ve experienced before—and in this case, different means far better. His approach is structured, intelligent, and focused on real progression rather than shortcuts. Thanks to his guidance, my game has evolved, and I’ve seen clear improvements in my technique, movement, and confidence.
What truly sets Jack apart is his patience and dedication to detail. He takes the time to explain, correct, and refine even the smallest elements, which makes a huge difference in long-term development. He genuinely cares about his students’ progress.
The process takes time, but under Jack’s tuition, anyone who is willing to put in the work can expect real results. I highly recommend him to anyone serious about improving their boxing skills
Great attention to detail. Noticed big improvements in my mobility especially in regards to my hips. Very good boxing trainer and he prioritises proper technique. You can expect guaranteed results if you listen and stay consistent.
Mathew
I started boxing with Jack in 2021 when I had a ruptured ACL ligament. Despite my injury, Jack spent the time teaching me the correct technique without causing me anymore pain or injury. Following my surgery, he not only got my footwork back into play, but structured my boxing training around my essential physiotherapy.
Jack had extensive knowledge about my injury and was able to get my movement back far quicker than even the physiotherapists predicted. From that point on I would also do personal training sessions with Jack in the gym, learning how to lift weights correctly after years of putting myself at risk.
Jack is incredibly knowledgeable, professional and generally just a great coach/personal trainer. There is no other professional in his field I would rather work with.
Matt
Jack had extensive knowledge about my injury and was able to get my movement back far quicker than even the physiotherapists predicted. From that point on I would also do personal training sessions with Jack in the gym, learning how to lift weights correctly after years of putting myself at risk.
Jack is incredibly knowledgeable, professional and generally just a great coach/personal trainer. There is no other professional in his field I would rather work with.
Jack is an outstanding coach. He combines deep knowledge with a grounded, approachable style, and it’s clear in every session how much he genuinely loves what he does. His coaching is consistently effective, and with time you can expect to see real, meaningful progress. Training with Jack is an investment that truly pays off.
Michele Bucci