Michael Jordan was one of the first NBA players ever to have his own trainer, and Tim Grover was his guy.

Grover's access to Jordan has long been as good as anybody's, and now the trainer to Jordan, Kobe Bryant, Dwyane Wade and others has just released a book called "Relentless: From Good to Great to Unstoppable" about building NBA greatness.

Grover sat down with us on Tuesday for a series of interviews. This first one is about Michael Jordan, and includes a shocking bit of Jordan insight from Grover.

You know Jordan's famous "Flu Game," when Jordan famously fought illness to succeed in Game 5 of the 1997 Finals in Utah.

Grover says Jordan didn't have the flu at all. Bill Simmons and Jalen Rose have recently debated whether or not Jordan was in fact hung over for that game, a suggestion that Grover scoffs at.

The real truth, Grover says, is that Jordan was poisoned.

"100 percent," Grover says on TrueHoop TV. "He was poisoned for the 'flu game.' Everyone called it a flu game, but we sat there. We were in the room." Grover explains: