Mark Madsen (@madsen_mark) is currently the Los Angeles Lakers Assistant Coach, previously serving as a coach in the NBA Development League, an assistant coach at Stanford University, and the Los Angeles D-Fenders coach. A former basketball player from Stanford University, Madsen was selected in the 1st round of the NBA draft by the Lakers. With 9 years of NBA experience Madsen spent 3 seasons with the Lakers and 6 seasons with the Timberwolves.

As Madsen says here, you can coach body language. He suggests showing clips of times when an athletes has good body language and compare and contrast that to clips of when an athlete needed some improvement. Coaches can point out the effects of what that negative body language has on the team, the coaching staff, and fans.