Lauren,If you aren't already doing it, try to incorporate at least a couple of activities that involve getting up and moving around.
For example, there is the classic "tape the different parts of a text on a wall" (it can be sentences that form a paragraph, or short paragraphs that form a longer text). You have different groups of students with enough members to that each fragment will be done by one student. Each student gets up from the group and goes to a wall. The student tries to memorize what is there, and then return to the group and report it (NO WRITING IT DOWN). One the student returns to the group, someone in the group writes it down. If the student hasn't remembered all of it, or the group questions the correctness of the text, the student runs back and returns (STILL NO WRITING DOWN!). You can decide if it's a friendly competition or just an activity without a winner.Another one is the survey, good if you are having students practice questions. Students have a handout that has several different "Find someone who has" or "...who has never..." ideas. Find someone who has never ridden on a train. (Have you ever ridden on a train?) Find someone who has been to Disney World. (Have you ever been to Disney World?) Figure out ideas that no single person would be likely to have done (or not done), so that students have to circulate to find all the people.Besides an activity or two that have people moving around, shift the type of exercise. Follow a reading exercise by a listening or pairwork speaking exercise. Then maybe a grammar activity (the kind of discrete tasks that I think Robin Sulkosky was suggesting).Karen