The problem of insufficient effectiveness of basic aikido techniques due the low level of musculoskeletal apparatus flexibility in young aikidoists was identified. The article considers the possibility of flexibility development as part of the physical education of aikido athletes at the course of training. Recommendations for developing flexibility aimed at improving of effectiveness of the aikido techniques performance including evasive techniques are offered. As a result of the experiment it was established that the efficiency of physical training increased in the aikido practitioners who had the flexibility development techniques included in the training course.