Trusted and Recommended by Doctors
reall Gym is a unique medical fitness gym in Japan. We work closely with numerous medical doctors to support women's health through evidence-based training and nutrition, building a strong track record of trust and results.
A gym highly recommended by many doctors
reall Gym is recommended by many healthcare professionals. Our exercise programs, developed based on the latest scientific evidence, have earned high praise from medical experts. As a pioneer in medical fitness, we regularly assess our clients' fitness and mental health. We regularly perform statistical analyses of the data we collect to evaluate the changes in our clients' fitness before and after attending our gym. We present these results at academic conferences and other professional gatherings.
Doctor Endorsements
Dr. Reika In, President of Mammaria Tsukiji.
Together with the passionate trainer Mr. Okumatsu, we have built a one-of-a-kind medical fitness gym. I recommend this gym with confidence and sincerely hope that many people will benefit from what it offers.
Dr. Atsushi Yoshida, Director of Breast Surgery, St. Luke’s International Hospital
We often hear high praise from patients about reall Gym, and I consider it to be a highly trustworthy facility as a medical fitness gym.
Meet Our Head Trainer
Koki Okumatsu, Ph.D.
Founder and Head Trainer of reall Gym / Doctor of Sports Medicine
Mr. Okumatsu began his research in exercise science for cancer survivors at the University of Tsukuba after his mother was diagnosed with stage III breast cancer. He went on to complete six years of collaborative research with St. Luke’s International Hospital—one of Japan’s leading institutions for breast cancer surgery—and got his Ph.D. in Sports Medicine.
In 2023, he launched reall Gym, continuing his mission to support women’s health through science-based training. He has also been featured in mainstream media such as NHK and Yomiuri Shimbun.
Why I Began Researching Breast Cancer and Exercise
In 2015, my mother was diagnosed with stage III breast cancer and underwent surgery at St. Luke’s International Hospital. I was the one who attended the post-surgery consultation, where Dr. Hideko Yamauchi—now a professor at the University of Hawai‘i Cancer Center—explained the importance of exercise after surgery. That was the first time I learned that exercise could benefit breast cancer survivors.
By coincidence, I was conducting research on exercise and nutrition for individuals with obesity at the University of Tsukuba at the time. When I shared this with Dr. Yamauchi, she listened with great interest. After several follow-up discussions, we eventually began a collaborative research project.
What to Expect on Your First Visit
How to Book a Session
If this is your first time, click here to book your initial trial session at reall Gym.
The reservation form is simple—just enter your name, email address, and preferred date for your trial.
After you submit the form, our staff will contact you via email within 24 hours with further details. Once you reply to that email, your booking will be confirmed.
What to Bring for Your First Session
Please bring comfortable workout clothes.
If you don't have any, we offer a rental set (top, bottom, and socks) for 550 yen.
We also provide free bottle of water.
Rental shoes are available free of charge in sizes 23–25 cm.
On the Day of Your First Visit
reall Gym is located on the 3rd floor of the same building as Mammaria Tsukiji Breast Clinic. The building has a Senbikiya fruit store on the ground floor, which can be used as a landmark.
Please note that many first-time visitors mistakenly go to the 5th floor, where the medical clinic is located. For your trial session, please come to the 3rd floor, not the 5th.
Once you exit the elevator on the 3rd floor, you will immediately see reall Gym. Our staff will greet you upon arrival.
