Background: The scientific literature establishes that people with mental impairments show high levels of sedentary behaviour.Aim: This research has the objectives of (a) Studying the effect of the intervention programme on the effect of basic physical qualities, balance and coordination and (b) Comparing the results obtained before and after carrying out the intervention programme according to the sex of the participants through a structural equation model.Methods: A quasi-experimental study was carried out with a pre-test-post-test group design, with a sample of 47 participants (46.8% male and 53.2% female). Questionnaires adapted to the characteristics of the sample were carried out to collect the data.Results: It is observed that the intervention programme has helped to improve the effect of basic physical qualities on balance and coordination.Conclusion: It is concluded that Kin Ball is a sport that improves the quality of life of people with special educational needs and that gender is a key factor influencing the development of basic physical qualities.