Book (Practical) Sports and physical education Athletes grow stronger as they get older. Sports

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Sports and physical education
Among Japanese, starting with Ichiro, why has the active life span of athletes in recent years been getting longer? This is the front line of sports science written by an American business journalist who interviewed many famous athletes! There are not many examples of Japanese, but the training based on the latest science by older athletes is extremely interesting for readers who like sports and training as well as for reading!