The core activity of the company 'Gross Tennis' includes:
* Tennis training and consulting for players
* Strategic consulting for companies and clubs in the field of tennis
* Coaching and accompaniment of trainers and entrepreneurs in their personal and professional development
* Publication of tennis teaching materials and books (e.g. 'The three paths to success')
* Creation of digital learning content (e.g. exercises and videos) for tennis training
Overall, the company's focus is on promoting and developing tennis players, trainers and companies, as well as providing resources and services for effective tennis training.