The short answer is the great majority of people would benefit from learning to use themselves better. We can divide the great majority of pupils who come for lessons into two broad categories:
The first has health problems brought on by bad use. In particular, those who suffer from back, neck and shoulder pain usually find the AT very helpful.
The second do not suffer particular problems but find the AT useful in preventing future problems and expanding their creativity and performance. To be more specific, the areas where the AT has been seen for decades as being extremely important is in the professional development of musicians and actors. More recently athletics, rowing, swimming and horse riding, amongst other sports, have appreciated the benefits of learning the technique.