Use this Verbal Boxing to practice the expressions of giving opinion

(Source: here)

Verbal boxing is a learning technique to practice the expressions of giving opinion. This is Matt Breyer’s idea from www.onestopenglish.com.  The original explanation of the technique can be downloaded here.

Students make groups of four. Like in real boxing, one member will be the boxer and the other students will be the coaching staffs.
In the classroom, the boxer is the spokesman, and the other members in the team will support the spokesman by providing him/her with opinions.

How I adapted this technique into my classroom?