What is the fine-grained topic of the following text: Huebner gave many colourful examples of how children and adolescents are able to develop their full human capacities by learning and training themselves how to write by hand, play outside and inside, socialise with others, learn art and music, practice crafts, sports, outdoor activities, and so on. Only return the topic.
Development of children and adolescents' full human capacities through various activities