How to Improve "Fatigue, Weight Gain, and Muscle Loss" After Breast Cancer Treatment. Special Event Featuring a Sports Medicine Doctor, a Breast Specialist, and Model SHIHO

Reall Gym, a medical collaboration-type personal gym operated by Reall Co., Ltd. (Chuo-ku, Tokyo; Representative: Koki Okumatsu), will host a free "Publication Commemoration Special Talk Show with SHIHO" at the Japan Publishing Club (Chiyoda-ku, Tokyo) on Sunday, April 26, 2026.
Focusing on the fatigue, weight gain, and muscle loss that many people experience after breast cancer treatment, a breast specialist and a sports medicine doctor will share information from both medical and fitness perspectives. Model SHIHO will take the stage as a guest to talk about the health habits she practices in her daily life.

[Background of the Event]

Breast cancer is one of the most common cancers among Japanese women, and survival rates have improved due to advancements in treatment technology. On the other hand, many people experience negative changes such as "intense fatigue," "increase in weight and body fat," and "decrease in muscle and physical strength" after treatment, leading to a high demand for health information and support after treatment ends.

Since its opening, Reall Gym has provided medical collaboration-type fitness, including post-cancer treatment support, through an 8-year joint research project with St. Luke's International Hospital. In March 2026, the gym's representative, Koki Okumatsu (Doctor of Sports Medicine, completed graduate studies at the University of Tsukuba), published a book summarizing this knowledge titled "A Book to Improve 'Feeling Tired Easily, Increased Fat, and Decreased Muscle' After Breast Cancer Treatment" (Kanehara & Co., Ltd.). The book ranked 5th in the weekly ranking (single volumes, all genres) and 1st in the medical book category at Kinokuniya Bookstore Shinjuku Main Store (March 2026), with a reprint decided within a week of its release.

This event was planned to take the opportunity of the book's publication to widely deliver health information after treatment to the general public.

[Program]

Part 1 13:00-14:00 
"Exercise and Diet Guide for Breast Cancer Survivors by a Sports Medicine Doctor x Breast Specialist" Reall Gym Representative Koki Okumatsu and Mammaria Tsukiji Director Reika In will take the stage. They will explain practical approaches to exercise and diet based on evidence for postoperative physical decline, muscle mass loss, and body fat increase.

Part 2 14:00-15:00
"SHIHO's Points of Exercise, Diet, and Well-being in Daily Life" Model SHIHO, who has over 800,000 Instagram followers, will take the stage. She, who is also highly supported in the field of well-being, will talk about the health habits she engages in daily.

[Speaker Profiles]

[About Reall Gym]

Reall Gym is a medical collaboration-type personal gym that provides personal training from a sports medicine perspective. After opening its first store in Tsukiji, Tokyo, a second store opened on March 17, 2026, in Shintomicho, Ginza (1st Floor, Shintomi 3-chome Building, 1-9-9 Shintomi, Chuo-ku, Tokyo). Located a 2-minute walk from Shintomicho Station and a 7-minute walk from Tsukiji Station. It operates in the Tsukiji/Ginza area as a medical collaboration-type gym attended by members aiming for health promotion, prevention and improvement of lifestyle-related diseases, and post-cancer treatment conditioning.

Official Website: https://mammaria.jp/medical_fitness/

[Book Information]

Achievements
Reprint decided within one week of release. Ranked 1st in the Medical Book Category on the Weekly Ranking at Kinokuniya Bookstore Shinjuku Main Store (March 2026)

Where to Buy
Amazon Sales Page: Click here to purchase

Published by: Reall Co., Ltd. (Reall Gym)
Location: 3rd Floor, Tsukiji Sky Building, 3-7-2 Tsukiji, Chuo-ku, Tokyo
Representative: Koki Okumatsu
URL: https://mammaria.jp/medical_fitness/