During this offseason, there are many players who should be taking the necessary time to practice their free throws.

The likes of DeAndre Jordan, Dwight Howard and Andre Drummond immediately come to mind as they continued to struggle from the charity stripe last year.

Another big man who isn't the most confident at the free-throw line is Oklahoma City Thunder center Steven Adams.

The New Zealander is already putting the work in to improve his numbers from the foul line, but there probably isn't another player adopting the technique he's using.

Most players go through specific routines and shoot repeatedly hoping that the repetition will bring confidence that they can then replicate in a real game environment.

Adams, however, has taken this to a new level.

With a reputation as one of the toughest men in the NBA, the 24-year-old has been living up to this on the practice courts as he has Thunder assistant coach Darko Rajaković come out of nowhere and, every once in a while, punch him in the stomach just when he least expects it, per Fred Katz of The Norman Transcript.

He then follows this up by shooting free-throws. It'll certainly be interesting to see if this increases his percentage from the line next year.

Adams has improved his free-throw percentage in each of the last three years, converting a career-best 61.1 percent in 2016-17.

The number still isn't great but he's showing a willingness to improve, even if it's in rather unconventional ways.

Every player has his own routine and it's unlikely that many will adopt the same painful method that Adams is.

His teammate Andre Roberson, another player who struggled badly from the free-throw line last year, is taking a different approach and wants to focus on the mental aspect instead.

“Get my body right, and my mind,” Roberson told The Transcript. “Confidence.”

The All-Defensive player shot a dismal 42.3 percent from the foul line in the last campaign and he struggled badly in the playoffs.

In the Thunder's opening round series with the Houston Rockets, they decided to intentionally foul Roberson towards the end of a crucial game four.

The shooting guard missed six of eight free-throw attempts during the final four-and-a-half minutes of that game and finished 2-of-12 for the night which proved costly to OKC as they lost that encounter and eventually went on to lose the series 4-1.

If it's any consolation for Roberson, even the league's best player LeBron James had his worst year with free throws.

But unfortunately, he doesn't possess many offensive talents to make up for it so OKC needs him, and Adams, to improve at the line next season to help their superstar duo of Russell Westbrook and Paul George.