Motivating students is a key to their success. Everyone wants to see a reward for their efforts, whether that is thru verbal/written means such as grades, physical rewards such as trophies, awards, etc., or purely psychological rewards (these students tend to be the self motivated overachievers that want to have perfect attendance/perfect grades in my experience). If you aren't leading their motivation thru these means they will swiftly lose interest. Our enthusiasm is contagious.