My Bootcamp classes are never the same and my students never know what to expect. I do not want their bodies to get used to any one form or routine, but I want to work their muscles in all different ways. Some classes I bring up the cardio higher, others I have less cardio and more toning, and others I run intervals of various activities. I always start with a warm up and stretch and end with extra abdominal work and a really good stretch.
By changing it up your students also never get bored.