A class EXERCISE is an activity that is done in a classroom setting, usually as part of a LESSON. The term 'class EXERCISE' can be broken down into two words: 'LESSON' and 'EXERCISE'. The crossword solution for the term 'class EXERCISE' is 'LESSON', which is a teaching session or course of study. An EXERCISE is an activity that is done to practice or develop a skill. Therefore, a class EXERCISE is an activity that is done in a classroom setting to practice or develop a skill as part of a LESSON.