The study was designed to develop and test benefits of a special endurance building model for junior (15-16 year-old) boxers to improve the competitive performance. Sampled for the study were 24 junior boxers from Yermak CYORSS in Surgut split up into Experimental Group (n=12) and Reference Group (n=12), with the Experimental Group trained by a high-intensity cycled practices to increase mitochondria in the fast muscle fibers; and the Reference Group trained as required by the standard training system. As recommended by V.N. Seluyanov, the Experimental Group trainings (6 sessions a week) were complemented by the muscle-group-specific maximal-pace 8-second repeated exercises. The first-stage trainings were dominated by the traditional physical conditioning practices with some boxing techniques excellence elements; and the second-stage trainings gave a high priority to the special endurance building practices. On the whole, the special endurance building model testing experiment lasted for 20 months. The study data and analyses demonstrated the explosive maximal-intensity 8-10-second exercises being beneficial as verified by the Experimental Group technical/ tactical progress in every round of the sparring bouts with the heart rate falls by the end of every round versus the Reference Group.
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