so after 13 responses of "less talk more action" how about some other input on how instructors actually keep the class from being boring? i think the number one thing is vocal intonation and enthusiasm in your speech. being energized in your actions. i also keep a close eye on students to watch for when they are getting bored with the repetition of something. i dont necessarily want to move to something different just because one person is bored. so i will notice if someone is lagging then walk over and motivate them somehow or ratchet the difficulty up for them by adding a new focus to the action or layer on another action.