YouTube's "Doctor of Preventive Medicine" with Over 1.08 Million Subscribers Teaches the Secret to Walking Energetically Even Past 100 Years Old -- 10,000 Steps a Day Was Too Much! "Medically Correct Way to Walk Without Falling or Pain: A Walking Revolution" to Be Released July 8, 2026 (Wed)

KADOKAWA Corporation (Headquarters: Chiyoda-ku, Tokyo; Representative Director, President & CEO: Takeshi Natsuno) will release the book "Walk Lively and Effortlessly Even Past 100! Medically Correct Way to Walk Without Falling or Pain: A Walking Revolution" (Author: Yuma Mori) on July 8, 2026 (Wed).

Dr. Mori, the author, manages a clinic while also running the YouTube channel "Preventive Medicine ch." As of July 2026, the channel boasts over 1.08 million subscribers and a cumulative total of over 200 million views.

This book aims to proactively solve the serious social issue of "seniors becoming bedridden due to falls and fractures" in an aging society. It is packed with a unique method developed by a doctor based on scientific evidence to cultivate "natural supporters (leg and hip muscles)" that can be practiced at home in just 15 minutes. This is Dr. Mori's first book dedicated to walking and is the definitive guide to building a body that can walk even past 100 years old.

Walking Reduces Mortality Risk by 14% -- The "Medically Correct Way to Walk" Taught by a Doctor

As aging progresses, seniors are increasingly becoming bedridden (requiring long-term care) due to minor falls in daily life. Public data shows that "fractures and falls" are the third leading cause of requiring long-term care (13.9%), making leg and hip problems a serious social issue (Source: Ministry of Health, Labour and Welfare "2022 Comprehensive Survey of Living Conditions of People on Health and Welfare").

Driven by a strong desire and passion from his experience in emergency medicine to "reduce the number of patients who rush to the hospital after their condition has worsened," Dr. Mori has condensed the essence of his "building legs for a lifetime of walking" video, which garnered approximately 300,000 views on YouTube. This book aims to contribute to society from the medical field, striving for a society where people can continue to walk easily and energetically to their desired destinations on their own feet even past 100 years old.

This book teaches not just "how to walk," but "how to walk to build a body that can continue walking indefinitely." It presents concrete guidelines based on medical knowledge, such as "10,000 steps a day is too much" and "traditional abdominal exercises are unsuitable for seniors," in a format that is easy to practice at home.

This content is recommended not only for seniors who feel "my knees hurt and I'm afraid to walk" or "I want to start walking but don't know the correct way," but also for those in their 40s and 50s who are "worried about their parents falling."

Features of This Book

1. Includes Self-Diagnostic Tests Based on Medical Evidence

This book is designed so that readers can first understand their current condition. It includes a "ring test" where you surround the thickest part of your calf with your thumb and index finger to assess the risk of sarcopenia (age-related decline in muscle mass and strength). It also includes numerous self-diagnostic tests to understand the condition of your legs and body, such as the "wall stand test," "squatting test," "forward and backward bending check," and "posture self-check."

● Ring Test: Make a ring with your thumb and index finger and surround the thickest part of your calf. If there is a gap, there is a high risk of sarcopenia; if it fits perfectly, it's moderate; if you cannot surround it, it's low risk. This is a simple check of muscle mass that can be done in 30 seconds.

● Chair Stand Test: Cross your arms in front of your chest and repeat "stand up and sit down" as quickly as possible 5 times.

If it takes more than 12 seconds, there is a possibility of sarcopenia.

2. Six Facts That Overturn Seniors' "Walking Common Sense" with Medical Evidence

This section explains six facts based on medical knowledge that those who "walk hard but see no results" should know.

10,000 Steps a Day is "Too Much" -- The Golden Rule for Healthy Longevity is "4,000 Steps"

Traditional Abdominal Exercises are Absolutely Not Recommended for Seniors -- The Biggest Cause of Lower Back Pain

Lower back pain has two types: "flexion-dominant" and "extension-dominant," and the treatments are completely opposite.

About Half of Stumbling Incidents are Due to "Inability to Lift Toes"

"Walking Stride Plus 10 cm" Awakens Dormant Muscles

The Sole of the Foot is the "Second Eye" -- A Precision Sensor Responsible for Balance

Based on medical research and clinical experience, this book presents a selection of practical methods that seniors can easily incorporate at home.

3. Over 30 Types of Training -- Can Be Started "While Sitting in a Chair"

It is structured in four stages: "Pain Care" → "Fall Prevention" → "Correct Walking" → "Rest."

Some exercises can be done while sitting in a chair or lying down, and no special equipment is required.

It is designed so that even seniors who do not have an exercise habit can start with "just one exercise."

【Cushion Abdominal Exercise】

While sitting in a chair, hug a cushion to your stomach, lean back, stop just before the backrest, and hold for 2 seconds.

This is an alternative exercise that can be done without straining the lower back, even though "traditional abdominal exercises are not recommended."

【Head Turn Walk】

This is a simple method where you walk while turning your head left and right every two steps. It trains the "sense of balance" in the semicircular canals, creating a body that does not sway when looking left and right at crosswalks.

The recommended distance is about 10 meters, 2-3 round trips. As you get used to it, also move your head up and down.

【Interval Walking】

"Brisk walking for 3 minutes → slow walking for 3 minutes" is one set, with a target of 5 sets per day (30 minutes total).

This is a walking method that improves cardiopulmonary function while dispersing the load on the joints.

Book Information

Title: Walk Lively and Effortlessly Even Past 100! Medically Correct Way to Walk Without Falling or Pain: A Walking Revolution

Author: Yuma Mori

Price: 1,980 yen (1,800 yen + tax)

Release Date: July 8, 2026 (Wed)

Format: 46 size

Pages: 192 pages

ISBN: 978-4-04-330119-5

Publisher: KADOKAWA Corporation

KADOKAWA Official Bibliography Details Page >>

Author Profile

Yuma Mori

Internal Medicine Physician / Occupational Physician / Operator of Preventive Medicine ch

Graduated from Kobe University School of Medicine. While working at the Department of Emergency and Critical Care Medicine at Fujita Health University Hospital, he keenly felt the social issue that "information that should be conveyed before illness progresses is not reaching patients or their families."

With the thought, "Is there anything I can do?" he launched the YouTube channel "Preventive Medicine ch / Doctor Supervised Uchikara Clinic" using animation. As of July 2026, he has surpassed 1.08 million subscribers and 200 million cumulative views, continuing to disseminate easy-to-understand medical information.

He currently manages Uchikara Clinic in Chikusa-ku, Nagoya City, and as the representative of Preventive Room Inc., he is working on the social implementation of preventive medicine.

His books include "Preventive Medicine from Age 40" (Diamond Inc.) and "Dementia Prevention is 90%" (Magazine House), among others. This book is Dr. Mori's first comprehensive guide to walking.

▼ YouTube Channel "Preventive Medicine ch / Doctor Supervised Uchikara Clinic"

https://www.youtube.com/@yoboigaku