Objective of the study was to complement and improve the group rhythmic gymnastics training system by a group routine synchronizing model with special technical and physical training elements. Methods and structure of the study. We used for the purposes of the study a contactless routine video replay analyses; postural control rating stabilometric Stabilan-01 digital test platform; skin electromyography testing 16-channel MegaWin ME 6000 electromyograph; training system design methods, expert valuations, new training model testing experiment; and the standard test data processing mathematical statistics toolkit. We sampled for the prior movement biomechanics study 21 year-old Masters of Sport (n = 2) from Lesgaft National State University, St. Petersburg champions and many-times winners of the national and international group rhythmic gymnastics events. The sample for the model testing experiment was complemented with the Lesgaft National State University team members (n = 5). Results and conclusions. Statistical analysis of the movement synchronizing elements showed the group movement synchronizing fault rate to significantly fall for the experimental period, with special improvements in the group collaborations due to a significant progress in the individual motor skills and synchronized performance quality on the whole. The study with the new group routine synchronizing model testing experiment found that the objective movement biomechanics test data and movement synchronizing difficulty classification analyses provide a sound basis for progress in the group rhythmic gymnastics routine synchronizing aspects. The new group routine synchronizing model was designed based on the movement synchronizing difficulty rating algorithm with the relevant stepped movement synchronizing training modules and training process goals to facilitate progress in the movement synchronizing teamwork and the relevant technical and physical training aspects for success in the synchronized group routines with the difficulty levels stepped up with progress in the movement synchronizing skills and experience.
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