Former Pitt center Steven Adams isn't a great free throw shooter in the NBA. Adams is a career 57% shooter from the line and is even worse in the postseason. This year with the Oklahoma City Thunder in the playoffs, he shot an abysmal 36% from the stripe.
He's trying to get better, though, and that's what counts. Adams' practice regimen is even sort of unusual, per the Norman Transcript:
He plays one of the most physical styles of any NBA player. And he owns an unmatched, eccentric personality. So, when he's working from the charity stripe, he has Thunder assistant coach Darko RajakoviÄ come out of nowhere and, every once in a while, upper-cut him in the stomach just when he least expects it.
Whatever works. Last year, Adams was near the bottom of the league in free throw shooting.