What would motivate the students to work much, much harder than they have all summer? They've gotten used to a leisurely pace and easy job assignments. Motivation might help, but motivation will only get so much done. After all, short of illegal steroids, nothing is going to work once muscle fatigue kicks in from carrying those 92-pound pieces of metal up a ramp all day long. What can you change about the way the work is done to deal with the unavoidable physical fatigue?