You have seen it a thousand times. Students come and they go. Sometimes they train hard and consistent, other times their attendance for whatever reason is lacking. There is no better way to help student retention than a personalized note sent snail mail.
Just purchase a few of these Great Job Cards cards, fill them out, write a personalized note to the student, add their address, put a stamp on them and drop them in the mail.
People get really motivated when they know you care about them and what better way to communicate that than with a handwritten message. It really motivates students to keep being consistent with class. Try them out now and engage who have been doing great, and working hard.