Pain-free. Efficient. Clearly focused.
I help ambitious professionals, self-employed individuals, and athletes finally get their knee, back, or shoulder problems under control – with sophisticated online and hybrid coaching that integrates seamlessly into your everyday life.
“Best training program”
5 out of 5 (15+ reviews)
You've tried everything – but nothing has really helped?
Doctors don't take their time, therapists only treat symptoms – and in the end, you end up back where you started: with pain and frustration.
My coaching is aimed at active people who want to break out of the pain spiral – and are looking for a path that truly works.
You'll receive a structured, individualized solution tailored to your body and your goals. No haphazard work, but systematic rehabilitation and strength training – digital, hybrid, or online, depending on what fits your daily routine.
Together, we'll rebuild your body – for a resilient, pain-free everyday life and the joy of movement.
Proven methods
Trust in strategies that work. You'll gain access to proven training and rehabilitation approaches that have proven effective in real life – clearly structured and individually tailored to your body.
Maximum flexibility
Your training adapts to you – not the other way around. Whether online, hybrid, or in-person, you train in a way that fits your daily routine. No fixed schedules. No stress. But with maximum predictability.
Holistic & sustainable
We don't just treat symptoms – we solve problems. Your coaching is based on in-depth root cause analysis. We work on movement quality, strength, and resilience – for real, lasting change.
At your pace
Individualized. Realistic. Effective. You set the pace – I provide the structure. No pressure to perform, but with clear progression. This way, you'll achieve progress that truly suits you.
Marius Rentschler – Your coach for pain relief & resilience with 10 years of experience
At 21, I was diagnosed with a bulging disc – accompanied by constant shoulder pain. The recommendation was rest instead of exercise. But that didn't bring any improvement. Massages and stretching only helped in the short term.
Frustrated, I began to intensively explore pain, movement, and resilience.
Today, as a sports scientist and rehabilitation coach, I help precisely those people who feel active and ambitious – but are held back by pain. My approach: a practical, scientifically sound system, individually adaptable, and with lasting effects.
Whether online or hybrid – with me you don’t get a standard program, but rather coaching that is tailored to your body, your everyday life and your goals.
This is what my clients say
I'm finally back to everyday life
With Marius, fun meets real expertise! In addition to personal fitness goals, we worked intensively on a complex cruciate ligament rehabilitation. I can recommend Marius to anyone who has specific fitness or rehabilitation goals and wants real success.
Selina
Dentist
I would definitely recommend it
Philip came to coaching with chronic patellar tendonitis after years of unsuccessful therapy. With a clear rehabilitation strategy, targeted strength training, and a lot of discipline, he trained regularly online for six months. The result: pain-free jogging, squats with 80 kg, and the ability to jump and sprint again.
Phillip
Politician
Marius is a true life-changer!
After being diagnosed with a herniated disc, I spent two years undergoing treatment at various physiotherapy practices without any real effect. Then I asked Marius for help, and after just a few training sessions, my back pain was significantly reduced.
After about six months, I was pain-free and could ride my road bike for 80 km at a time and jog without any problems.
~ Alexander ~
My rehabilitation priorities
Targeted rehabilitation methods for maximum progress – individually tailored to you.
SHOULDER PAIN & IMPINGMENT
Shoulder pain is often diagnosed with impingement – followed by rest, painkillers, or injections that only provide temporary relief.
I take a different approach: With targeted stimulation and training, we strengthen the shoulder – functional, stable, and ready for everyday life.
The goal is not prevention, but a safe path back to free, pain-free movement.
BACK PAIN & INTERVERTEBRAL DISC
Back pain is one of the most common complaints – and is often mistreated. Passive measures like massage or stretching relieve symptoms, but rarely address the cause. I take an active approach: By analyzing your movement patterns, we develop targeted strength training tailored to your individual needs. The goal is not only pain relief, but also renewed confidence in your body – both in everyday life and in sports.
KNEE PAIN & PATELLAR TIP SYNDROME
Knee pain – especially in the patellar tendon – affects many athletes. Painkillers, injections, or rest breaks rarely provide long-term relief; they simply suppress symptoms.
I take a targeted approach: We analyze your movements and systematically build resilience – for a stable, pain-free knee.
The goal is not just relief, but real performance in training and everyday life.
SHOULDER PAIN & IMPINGMENT
Shoulder pain is often diagnosed with impingement – followed by rest, painkillers, or injections that only provide temporary relief.
I take a different approach: With targeted stimulation and training, we strengthen the shoulder – functional, stable, and ready for everyday life.
The goal is not prevention, but a safe path back to free, pain-free movement.
BACK PAIN & INTERVERTEBRAL DISC
Back pain is one of the most common complaints – and is often mistreated. Passive measures like massage or stretching relieve symptoms, but rarely address the cause. I take an active approach: By analyzing your movement patterns, we develop targeted strength training tailored to your individual needs. The goal is not only pain relief, but also renewed confidence in your body – both in everyday life and in sports.
KNEE PAIN & PATELLAR TIP SYNDROME
Knee pain – especially in the patellar tendon – affects many athletes. Painkillers, injections, or rest breaks rarely provide long-term relief; they simply suppress symptoms.
I take a targeted approach: We analyze your movements and systematically build resilience – for a stable, pain-free knee.
The goal is not just relief, but real performance in training and everyday life.
What my customers say about me
I now have countless success stories, see for yourself!
Very competent
With Marius, fun meets real expertise! In addition to personal fitness goals, we worked intensively on a complex cruciate ligament rehabilitation. I highly recommend Marius to anyone who has specific fitness or rehabilitation goals and wants real success. Thank you for the great time!
Line rah
Worthwhile investment
I've been training with Marius for over half a year now, and I can recommend working with him to anyone in Frankfurt and the surrounding area who wants to focus on strength training and learn more about their body and a fit lifestyle. He addresses each client's individual needs and goals, helps them stay on track, and has scientifically sound answers to all questions – he's available via WhatsApp for this purpose at any time. And there's plenty of fun to be had during the training sessions, too! Of course, this kind of support and coaching isn't exactly inexpensive, but in my opinion, it's a worthwhile investment in your own health and well-being. 💪🏼
Anna
The best gift in a long time
I gave personal training with Marius Rentschler as a birthday present (I had a medical history of patellar tendonitis and a lot of stress), and to this day it was the best gift I could have given. Superbly competent support, flexible yet reliable, and the results are amazing! What started as an initial training session has turned into a long-term personal training relationship, and it doesn't seem to be ending anytime soon. I highly recommend it!
Malena todt
I can only recommend it
I've been training with Marius since January 2023.
Due to a herniated disc radiating into my left leg and the resulting back problems that significantly limited my daily (work) life, I was looking for a long-term exercise and supportive treatment.
Through consistency and constant adjustments to my training, Marius has achieved lasting success to date.
Through targeted muscle strengthening and flexibility in movement, my back pain has almost completely disappeared.
I highly recommend Marius.
Christopher Schmalfeldt
What makes Marius special
I've been training with Marius for two and a half years. At the beginning, training was a real challenge for me; I was totally unfit and not particularly athletic. With Marius, I managed to stick with it, significantly improve my fitness, and lose weight.
What makes Marius special:
- Marius is always friendly and a good motivator.
- He pushes me to my limits. This has allowed me to continually improve.
- He is very competent and has in-depth knowledge in all the areas he offers. When I had physical problems/pain, he adapted the training accordingly, so I quickly saw improvement.
- He truly adapts to my individual needs.
- It's fun to train with Marius, and I highly recommend him as a personal trainer.
Sabine horn
Marius is Alway prepared
I have worked with several Personal Trainers in Germany and the US, but only with Marius I experienced truly transformational results.
Marius is very knowledgeable about body composition, training strategies, health topics and nutrition. To every session he comes in very prepared, is always on time and his focus is completely on the session itself. He uses latest cloud-enabled technology to facilitate each session. Throughout the training and beyond he is very transparent his training strategy and he educated and enables me to utilize his techniques on my own.
Scheduling sessions with Marius is easy, also outside of the sessions itself, he is very responsive.
Marius has definitely helped me to reach my fitness goals over the last 12 months and set new ones. He has a genuine interest that his clients make progress and see true results. Overall, he has a friendly and authentic personality, his sessions are always fun. He is definitely top-notch.
Frank F.
improved significantly
I started working with Marius 7 months ago. At the time, I was going to the gym about 3x/week and seeing little to no improvement and also gaining shoulder pains from the exercises. After a few sessions together, we worked on a lot of different things to make sure my technique was right and that my needs were being looked at. After that, I finally managed to improve my workouts, generally increase my strength and get rid of my shoulder pain. And by doing so, my motivation has improved significantly. We worked together as well on a nutrition plan which made me lose weight while maintaining my muscle mass.
I am extremely happy with everything that Marius has provided - we meet 1x/week consistently, he is always there to give me tips about workouts and nutrition and is also super flexible when I have to travel. We even decided to extend my first plan for an additional 6 months. So 100% recommended!
Daniel sa pereira
I can only recommend it
I've been training with Marius for six months. At the beginning, I was very skeptical about whether we could achieve my goals as he promised. After six months, however, I have to say I'm extremely satisfied: we've achieved almost all of my goals:
- Lost 15 kg
- I feel fitter and more flexible
- My strength and confidence in my body are much better
- Training is tough but fun
With Marius, training is finally fun again, and I've developed a good routine for myself again. I'm looking forward to tackling my next goals with him.
Iwona cancedda
Pains & Gains - The Health Podcast
Discover exciting excerpts from my podcast "Pains & Gains" with my personal trainer colleague Sascha Köhler – there we discuss fitness and pain topics, our careers, and take a critical look at the healthcare system.
Want to listen to the full episodes? You can find the complete podcast on all major streaming platforms.
write me an email
If you have any further questions, please do not hesitate to contact me.
info@mrpersonaltraining.de
Call me
Mon-Fri from 9:00 to 18:00
+49 (0) 172 4639133
Frequently asked questions
Here you'll find the most important answers to my coaching questions. If you don't see the answer to your question, please feel free to contact me directly.
Does online coaching actually work as well as in-person coaching?
Yes – with structured video sessions, regular check-ins, and individually tailored training plans, online coaching is just as effective as in-person training. Many of my clients appreciate the flexibility and direct 1:1 support, without any travel time.
I have pain (e.g. in my back or knee) – is coaching still right for me?
Especially then! My coaching is specifically designed to reduce such discomfort through targeted movement analysis and training adjustments. I will accompany you step by step to become pain-free and more efficient.
Do I need expensive equipment or a gym to train?
No. I'll put together a training plan for you based on your goals and situation that works with what you have available—whether at home, in the gym, or on the go. If you need equipment, I'll give you specific recommendations.
How exactly does hybrid coaching work?
With hybrid coaching, we combine in-person sessions (e.g., at regular intervals or as needed) with digital 1:1 coaching. This gives you maximum flexibility while still maintaining the closeness and control of face-to-face meetings.
I have a busy schedule – is coaching feasible in terms of time?
Definitely. As a freelancer and coach, I know how important flexibility is. We'll tailor your coaching to fit into your daily routine—without added stress, but with maximum impact.
How quickly will I see results?
It depends on your current status, your goal, and your implementation. Many of my clients report less pain, more energy, and improved performance after just a few weeks—both in everyday life and during training.
