About
Qualifications
Specialisms
Location
Reviews
About
Hey Team, I’m Coach Karen Martinez.
For the past 10 years, I’ve helped people from all walks of life not just achieve their fitness goals—but completely transform their lives. My coaching goes beyond workouts. It’s about building strength in every sense: physically, mentally, and emotionally.
When we work together, it’s not just about looking good—it’s about feeling good. I’ll help you break past limitations, build confidence, and create a body and mindset you’re truly proud of. Whether you want more energy, better balance in your life, or simply to feel like the best version of yourself, I’ll be in your corner every step of the way.
My goal is simple; I want to help you become stronger, fitter, healthier, and happier.
My Approach:-
It’s NOT just about training—it’s about transformation. I provide the coaching, support, and accountability you need to positively transform the beliefs, habits, and behaviors that have been holding you back. You won’t just see results—you’ll gain the tools to sustain them for life.
My vision:-
I’m building more than just a training program—I’m creating a community. A place where we support each other, train together, and push beyond what we thought was possible. Through events, workouts, and shared experiences, we’ll create something bigger than just fitness—a true team that thrives together.
If you’re ready to commit to yourself, I’m here to help you every step of the way.
Let’s get to work.
For the past 10 years, I’ve helped people from all walks of life not just achieve their fitness goals—but completely transform their lives. My coaching goes beyond workouts. It’s about building strength in every sense: physically, mentally, and emotionally.
When we work together, it’s not just about looking good—it’s about feeling good. I’ll help you break past limitations, build confidence, and create a body and mindset you’re truly proud of. Whether you want more energy, better balance in your life, or simply to feel like the best version of yourself, I’ll be in your corner every step of the way.
My goal is simple; I want to help you become stronger, fitter, healthier, and happier.
My Approach:-
It’s NOT just about training—it’s about transformation. I provide the coaching, support, and accountability you need to positively transform the beliefs, habits, and behaviors that have been holding you back. You won’t just see results—you’ll gain the tools to sustain them for life.
My vision:-
I’m building more than just a training program—I’m creating a community. A place where we support each other, train together, and push beyond what we thought was possible. Through events, workouts, and shared experiences, we’ll create something bigger than just fitness—a true team that thrives together.
If you’re ready to commit to yourself, I’m here to help you every step of the way.
Let’s get to work.
Qualifications
Level 2 Fitness Instructor
Level 3 Personal Trainer
Level 3 Sports Massage Therapist
Level 4 Lower Back Pain & Rehabilitation
Level 3 Personal Trainer
Level 3 Sports Massage Therapist
Level 4 Lower Back Pain & Rehabilitation
Specialisms
- Functional Movement
- Weight Management Coaching
- Mobility Training
- Exercise for Injury Prevention and Rehabilitation
- A holistic approach to fitness that integrates exercise, nutrition, recovery, and mindset—helping you become stronger, healthier, and more energized in everyday life. It’s about achieving long-term, sustainable results, not just quick fixes.
- Weight Management Coaching
- Mobility Training
- Exercise for Injury Prevention and Rehabilitation
- A holistic approach to fitness that integrates exercise, nutrition, recovery, and mindset—helping you become stronger, healthier, and more energized in everyday life. It’s about achieving long-term, sustainable results, not just quick fixes.
Location
11 Reviews
11 out of 11
I’ve been training with Karen for 7 months and it’s been a joy. I don’t like going to the gym but I look forward to it now when I’m training with Karen. She listens and ensures that we stay focused on my goals, pushes and challenges me, and on top of it all is a lovely human being! I’ve lost weight, become stronger and fitter, all thanks to KD 💪🏼💪🏼
Priya
I first started training with Karen just over a year ago and it has been fantastic. I’ve lost 10kg in weight and I’m so much fitter and stronger. The exercises we do are really varied and fun, no two sessions are the same. Karen really listens to how you’re feeling and really encourages you to be the best that you can. I’d 100% recommend Karen to anyone wanting to start training.
Rachel
I've trained with KD45 fitness for 9 months. Karen is amazing. My fitness level was very low before we started and while I still have a long way to go, every little win matters. I couldn't climb stairs without breaks and now I can do 250! I don't tire as easily and can do more. Karen has been incredibly supportive throughout and always accounts for any injuries. We never do the same thing twice. Highly recommend her!
Anukanti Hedge
At the end of last year, after 20+ years of no exercise, I decided it was time for a change. A holiday in Greece made me realise I wasn’t happy with my body—I could either hide away or get fit.
I joined a gym, thinking it would be an easy fix, but quickly realised I had no idea what I was doing. That’s when I found Karen.
She has been my wife’s and my trainer this year, and working with her has been one of the most rewarding decisions I’ve made. I have nothing but admiration for her. I’m incredibly grateful for how she’s transformed us physically and mentally.
If you’re looking for a PT to guide you on your fitness journey, you’d be lucky to have Karen!
Sam
I joined a gym, thinking it would be an easy fix, but quickly realised I had no idea what I was doing. That’s when I found Karen.
She has been my wife’s and my trainer this year, and working with her has been one of the most rewarding decisions I’ve made. I have nothing but admiration for her. I’m incredibly grateful for how she’s transformed us physically and mentally.
If you’re looking for a PT to guide you on your fitness journey, you’d be lucky to have Karen!
Loved training with Karen! After years of inactivity, she got me back in shape with patience and dedication. She kept me on track with workouts, nutrition, and regular WhatsApp check-ins, which made a huge difference.
I trained twice a week without fail for nearly a year, never missing a session. With her help, I lost 28kg! Having worked with other trainers before, I can confidently say Karen is the most committed, both in and out of the gym.
Thank you, Karen, for all your support—you’re amazing!
Tina
I trained twice a week without fail for nearly a year, never missing a session. With her help, I lost 28kg! Having worked with other trainers before, I can confidently say Karen is the most committed, both in and out of the gym.
Thank you, Karen, for all your support—you’re amazing!
I started training with Karen nearly two years ago when I’d lost motivation and confidence. Now, everything has changed!
She took the time to understand my goals and focused on creating sustainable habits. We train twice a week, and she also designs home workouts for me. Thanks to her, I now walk 10,000+ steps daily, exercise for 60 minutes, and feel healthier both physically and mentally.
I’ve lost fat, built muscle, and feel proud of my progress. If you’re looking for a dedicated PT, I highly recommend Karen!
Antonia Frangakis
She took the time to understand my goals and focused on creating sustainable habits. We train twice a week, and she also designs home workouts for me. Thanks to her, I now walk 10,000+ steps daily, exercise for 60 minutes, and feel healthier both physically and mentally.
I’ve lost fat, built muscle, and feel proud of my progress. If you’re looking for a dedicated PT, I highly recommend Karen!
Karen is the rare kind of personal trainer who can look at both the small details and the big picture of each individual client. I have seen great results since working with Karen.
If you are looking for a personal trainer in the Greenwich area, I wholeheartedly recommend Karen.
Nalima
If you are looking for a personal trainer in the Greenwich area, I wholeheartedly recommend Karen.
I've been training with Karen for years, and I've seen fantastic changes, not only in my body but also mentally. I’ve lost nearly 8kg, and I feel stronger than ever. My body looks more toned and powerful than before!
Her sessions and support are excellent, she always motivates me to go the extra mile. With her positive attitude, the sessions are much more lively and almost become a form of therapy for my long and tiring days at work.
Without a doubt, I couldn't have made a better choice. Thanks to Karen for all the support during this time. I highly recommend her coaching services.
Lorena
Her sessions and support are excellent, she always motivates me to go the extra mile. With her positive attitude, the sessions are much more lively and almost become a form of therapy for my long and tiring days at work.
Without a doubt, I couldn't have made a better choice. Thanks to Karen for all the support during this time. I highly recommend her coaching services.
I cannot say enough good things about my transformation! I’ve been working with Karen for 2 years now and from day one, she focused not only on my physical fitness but on creating sustainable, healthy habits that transformed my life inside and out. She truly helped me build a foundation for a better, healthier me. With her guidance, I achieved fitness goals I’d never thought possible and discovered the confidence to keep pushing forward. Her genuine care, motivation, and personalised approach made all the difference. If you’re looking for a coach who will go above and beyond to help you achieve long-lasting change, Karen is the person to trust!
kayy
I couldn’t have asked for a better coach! Ive lost nearly 12kg in the space of few months of working with Karen. She held me accountable in the best way, pushing me to reach my potential while also being there to celebrate every little win along the way. My progress has been amazing, but more importantly, I feel mentally stronger and more motivated than ever.
I’ve learned so much about my body and how to fuel it effectively. Her approach is empowering and sustainable, and she genuinely cares about your progress. I’ve never felt more confident and in control of my health. If you want to truly understand and transform your fitness journey, Karen is your girl!
Jessica
I’ve learned so much about my body and how to fuel it effectively. Her approach is empowering and sustainable, and she genuinely cares about your progress. I’ve never felt more confident and in control of my health. If you want to truly understand and transform your fitness journey, Karen is your girl!
Karen has been my personal trainer for just over 2 years and I would highly recommend her. She has built me up from barely any strength and no habits, to someone who actively does want to go to the gym and I'm significantly stronger! Ive lost nearly 21kg. She held me accountable in the best way. My progress has been amazing, but more importantly, I feel mentally stronger and more motivated than ever.
I couldn’t have asked for a better coach!
We always chat all the way through our sessions and she encourages a lovely community with her clients. Highly recommend - wish I could take her with me as I move out of the area!
Rachael Paradise
I couldn’t have asked for a better coach!
We always chat all the way through our sessions and she encourages a lovely community with her clients. Highly recommend - wish I could take her with me as I move out of the area!