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From The Science of Wrestling and the Art of Jiu-Jitsu:
A wrestler has practically unlimited vitality, for this strenuous sport does not burn up your energy as boxing or fighting does. Wrestlers who lead clean lives are at their best between 35 and 40 years of age, whereas most fighters are through at the age of 30 owing to the continual strain of the road work which burns up their vitality and tissues.
Bro science alive and well in 1923!