just read this which is kind interesting
https://www.thehockeybeast.com/nhl/wayne-gretzky-shares-the-most-awesome-story-about-what-brad-marchand-did-last-summer-he-even-calls-it-one-of-the-great-stories-hes-ever-heard-in-hockey/?fbclid=IwZXh0bgNhZW0CMTAAAR18ACz-BjBui0JBc6XVyWvlXRX1NlFGkyMWmnItCcMCYmvY80ECwD2o6ko_aem_AZUDszEqwFw8yGYMU5MY3_ZR2JGiQyexJM50_Y1w6hpJhu8B080piOHboWuRQI5wKBQHC_fUFhw2IvSYPMktYVyD
From the article if you don't want to read or can't read
"One of the great stories I’ve ever heard in hockey, and there are so many good stories because there are so many great people in it,” Gretzky said. ”But I was told by a friend that he went to training camp last year with the rookies for five days and practiced with them to teach them how to be a pro and what it’s like to be a Boston Bruin.”