Have you ever wondered what it is that NBA trainer to the stars Drew Hanlen does to boost the games of players like star Boston Celtics forward Jayson Tatum? The Pure Sweat head honcho recently took some time on a recent episode of the NBC Sports Boston's "Hoopin'" show to talk it over with NBC Sports host Kayla Burton.

The Boston Celtics are among the NBA’s best teams. Their strong streaks make them top championship contenders. Jayson Tatum, their offensive leader, expressed his desire to inspire others, just as LeBron,

Hanlen helped Tatum become the player he is today, and continues to help the Celtics star hone his craft to new heights. And now, Hanlen has a book.