Personal Trainer Series: What To Look For in A Personal Trainer--Part 2

Ability to teach the exercises.

First, this requires knowledge of proper form and technique -- which is sometimes a problem with trainers.

Second, this requires pedagogical techniques that communicate the exercise clearly and effectively. Your trainer should provide a conceptual understanding of why and how the exercise works, rather than just telling you to do it. Understanding is crucial to mastery.

Third, this requires an ability to correct poor technique, as well as to reinforce good technique. You should also feel as if you are always learning within your limits. Learn a new movement with no weight first, master the movement, then add small amounts of weight, always working within your capabilities.