After the strength work and partner work, the class broke into a few groups (according to skill level) and repeated choreographed routines called kata , which involve a series of punches, kicks, and blocks with an imaginary foe.
The class did not take skill level into consideration when they broke off into groups. 
mnli hypothesis: The class did not take skill level into consideration when they broke off into groups.  premise: After the strength work and partner work, the class broke into a few groups (according to skill level) and repeated choreographed routines called kata , which involve a series of punches, kicks, and blocks with an imaginary foe.