Bentreemin

I think you dad was refering to a movement LOL

But seriously, movement in bonsai is usually concerning the trunk line and its twists / bends / turns in relation to the form of the tree. The term movement is borrowed from the art of painting in 2D relating to how an image suggests flow or naturlism or action, etc EG: in simple terms if a tree is heavy on foliage to right then you would want movement of the trunk to the left to balance up or a left branch to do the same. In practicality you would engineer this vice versa if you see what I mean.
It is a difficult term to explain in words as it relates to composition, visual input and ones impression of the illusion achieved to an extent. Its also confusing for new people to bonsai as trees do not tend to move too quickly unless bent with wire or stolen!

My advice is lighten up and try to achieve attractive designs, or better still, from what I hear, attend a workshop with someone skilled as your mentor.
My 2cents