Does this trainer walk the walk? As obvious as this can sound, any trainer worth their salt have to be in brilliant shape or at the least appear to be in shape. If a teacher cannot hold themselves on target with their personal health regimen then it'll be hard for them to inspire, hold accountable, and encourage you to new levels. There can be exceptions to this, however I do not experience that is a risk well worth taking with your investment of time, cash, and tough paintings. I have seen too many running shoes, those who manifestly may want to use a teacher themselves, that continuously fail in leading their customers to their goals.