Come on in and get comfortable in this unique environment – for a stimulating workout experience and relaxing moments afterwards.
Become a team with your personal trainer – for the sake of your own health.
Get the most out of your body – feel fitter and more attractive than ever before.

Welcome to K4!

The maximum of 150 members guarantees a training in peace and with discretion.
Park your car comfortably and free of charge in the in-house underground garage.
Exercise among like-minded, meet successful people looking to exchange views and network.

  • I can’t imagine training anywhere else than K4 anymore. Thanks to its highly professional care and very welcoming studio atmosphere, I just feel so comfortable here. The training results are motivation to come more often as well. If you are looking for quality, this is the right place for you.

    Marianne Hund
    (Deutsche Bank)

  • I just don't enjoy working out by myself. However, with Alex and Jannis I do. What I particularly like about K4 is the quiet and always discreet atmosphere. Thanks to regular workout sessions, I finally feel in shape again and no longer have back pain. Thanks to you both!

    Andreas Dombret
    (Member Executive Board, Deutsche Bundesbank)

  • Training with Alex is a physical and mental enrichment for our very active life. The regular Yoga classes with Nadine have improved our agility and have proven to be the perfect addition to our strength training.

    Anette & Michael von Zitzewitz
    (Owner of a PR agency / former head of Messe Frankfurt)

  • You've inspired me with your personal love of sports, nutrition and a healthy lifestyle. Every single workout, which you accompany with so much dedication, brings so much joy that you simply do not want to live without it anymore.


  • For about one year now, I have prescribed myself regular exercise. Thanks to your support, dear Michi and dear Alex, I feel more flexible and stronger than ever. My posture has changed, and that feels really good. With your dietary advice, I have also lost a few pounds. Keep it up and thank you so much!


  • The two of us, dear Alex, have been a terrific team for the past 18 years! Our regular sessions have made me physically and mentally fit for all the professional and private challenges of everyday life. I look forward to many more lessons at K4. Yours Niko.

    Nikolaus Hensel
    (Bögner, Hensel & Partner)

  • It could not be any easier: park in the underground car park for free, get my workout clothes out of the locker and spend an hour, undisturbed and discreet, concentrating on the fundamentals: my training!

    Ulrich Höller
    (GEG Board)

  • The central location of K4, the private atmosphere and the professional care provided by Jannis Kanellopoulos have ensured that regular exercise has become an integral part of my life.

    Prof. Dr. Norbert Winkeljohann
    (CEO PWC Deutschland)

  • For the past 16 years, I have regularly been training with Jannis Kanellopoulos. The training helps me balance the stress of everyday life and my professional work. After every workout, I feel much better than before, physically and mentally.

    Niko Gatzias
    (Restaurateur, Der Grieche, Long Island Summer Lounge)

  • For me training at K4 is training at the highest level: personal, individual, diverse, smart and professional. All of this in a modern and very well-maintained studio!

    Annick Kleine
    (Managing Director Hellwig Wertpapierhandelsbank GmbH)

  • What makes K4 special for me, besides its great facilities, are the people: motivated serious customers who come to train and not to pose, as well as professional trainers who create a respectful, motivating and welcoming atmosphere every day. Over the course of six months of training, I have almost lost 20 kilos thanks to the support of my two coaches Nadine and Chris, who advise me in my training and diet.

    Sina Tultschinetski

  • Since I do not feel like doing sports on my own, I am glad that Michaela motivates me to train regularly. The fact that I am fitter today than I was 10 years ago has also registered with my environment. I am constantly asked about my much improved posture.

    Ingo Mayer
    (Entrepreneur and former IHK president)

  • Sports has always been an integral part of my life, but without professional guidance and consequently without a concept. Michaela has developed a program that perfectly fits my needs. During our sessions she pays close attention to my technique and correct execution of the exercises. Not only did I get a grip on my slipped disk, but I'm now fitter than ever.

    Thomas Arndt

  • A life without K4 and the boys is conceivable – but no longer possible. The last great Greek Ioannis takes care of my muscles, stomach and head 24/7!

    Michael Neff
    (Art dealer)

  • Working out with Alex on a weekly basis does me good and I always have enough energy for long production days. My life is a lot healthier now than 20 years ago and I feel great.

    Simon Bolz