In the NBA’s offseason of 2001, …

In the NBA’s offseason of 2001, then-Celtics forward and Chicago native Antoine Walker received an unexpected phone call from retired superstar Michael Jordan. “He called me,” Walker said on the McNeil & Parkins Show on Tuesday. “And he was like, ‘Hey, I’m thinking about making a comeback. I need you in the gym with me.’” With the help of Walker and personal trainer Tim Grover, Jordan wanted to begin working toward a return to basketball. It began as just the three of them, Walker said, until 2 p.m. each day, when pickup games would take place.