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Incredible, but true. In 1948 he started running sixty 400-metre intervals a day, with only a 200-metre jog in between. In 1955 he trained harder than ever, running as many as ninety 400-metre intervals daily.

From:Sri Chinmoy,Emil Zatopek: Earth's Tearing Cry. Heaven's Beaming Smile, Agni Press, New York, 1980
Sourced from https://srichinmoylibrary.com/ez