First, and most importantly you must do this yourself and lead by example. You can not encourage someone to do what you are not doing yourself. Once you explain to them that this is the key building block to success here they should understand. IF they do not do it then it is a good indication that they are not serious about their SFI business and you need to continue to enroll people who are in fact serious and focus on supporting those in your group who are performing on a serious level.
