I have found that it takes many different ways to keep the students focused on lecture. Some of the ideas I have come up with are to compare some of the more complex ideas, to everyday situations the students may experience. I also have brought some creative activities to class to bring some hands-on learning for students who may learn better that way. For reviews, I have played things like jeopardy to try and create a fun environment. I think those things really help pick up the attention of the lessons. Do you have any other suggestions on how to pick up a slow subject? I am always looking for new ideas!