NBA champion Metta World Peace (previously known as Ron Artest) has a warning for anyone who thinks they’re a hard worker: there’s probably someone—maybe even on your team—willing to work even harder than you. It’s a career lesson he learnt from Kobe Bryant.

In an interview with Fortune’s Orianna Rosa Royle at Web Summit Qatar, World Peace revealed that he had heard the late Los Angeles Lakers basketball player was grinding hard at the gym before long days of grueling training.

So one day, World Peace showed up to the gym at 8 a.m. to see if the rumours were true. “I got to the gym and I said, let me see if Kobe is really in the gym.”

He arrived at 8 a.m.—what he considered early—and Bryant wasn’t mid-set or cooling down. He already leaving.

“He was all showered up. He was done,” the 46-year-old recalled. “And I thought I was working hard!”