O estudo mescla fronteiras das investigações sobre a criação do ator levando em conta a improvisação. Tomando-se o trabalho de Arthur Lessac como ponto de partida para criar, realiza-se uma contaminação entre este e as seguintes pesquisas sobre improvisação e composição cênica: Contato Improvisação, Viewpoints, além de técnicas de narrativa e espontaneidade do diretor e professor britânico Keith Johnstone. A experiência prática foi realizada em estágio docente na disciplina de Atuação III da graduação em Teatro na UFRGS. Os pensamentos de Arthur Lessac, Steve Paxton, Anne Bogart, Tina Landau e Keith Johnstone se entrecruzam com pesquisas contemporâneas de diferentes áreas para discutir o processo de criação do ator-estudante. / The study mixes borders in the investigation of the creation process of the actor, taking into account the improvisation. Having the Lessac Work as an access way into creating, a contamination was held among his work and the following researches on improvisation and scene composition: Contact Improvisation, Viewpoints, as well as narrative techniques and spontaneity studied by the director and professor Keith Johnstone. The practical experience was held during teacher training in Performance III, Undergraduate Program in Theatre at UFRGS. The ideas developed by Arthur Lessac, Steve Paxton, Anne Bogart, Tina Landau and Keith Johnstone intersect contemporary researches in different areas in order to discuss the creation process of the actor-student.

This thesis focuses on the Theatresports as a general category of improvisational theatre. Theoretically analyses their structure in terms of theatre studies and interprets the principles of this specific approach to theatre production, deals with their history and development, also is trying to establish a suitable theoretical and conceptual apparatus for them. It also reflects the decade of work of Theatresports in the Czech Republic, summarizes their characteristics and places them in context with other selected speeches theatrical improvisation on the Czech scene. Keywords: Theatresports, Keith Johnstone, improvisational theatre, improvisation, contemporary Czech theatre, Czech improvisational League