BOULDER — On the set of Space Jam 2, a young Isaiah Johnson soaked in the approach of an NBA icon.

Colorado’s freshman guard, then 12 years old, was working out with LeBron James at Warner Bros. Studios in 2019. Johnson’s dad, Chris Johnson, is a renowned trainer whose clientele features a slew of accomplished pros, including James.

That day, Isaiah rebounded for King James as the future Hall of Famer concluded his workout with full-court sprints, capped by 10 dunks at each end of the floor.

“He had already worked out for an hour-and-a-half, and then did those sprinting dunks with (the highest intensity),” Johnson recalled. “Obviously, LeBron is one-of-one, but that just made me realize, that dude never stops. He was always putting in extra training.

“… It’s definitely a blessing bein

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