Know thy limits.
There are times when I turn clients down because I'm aware of the value I bring to the table.
For example if you are into bodybuilding, I'm the wrong guy to hire. Although many smart body builders will build up a base strength first then sculpt and shape it through bodybuilding.
If you are professional power lifter or olympic lifter then I'm not the guy to hire.
If you like doing cardio with light weights (90% of the people I see at the gym are doing this), then I'm not your guy to hire.
What I am though is a professional barbell strength coach. And if you want to double your strength in less than 3 months or triple your strength in less than 6 months, then I can help.