Multi-Functional Technical Devices for Improvement and Control of Athletes' Preparedness in Martial Arts - Olha Zadorozhna; Yuriy Briskin; Maryan Pityn; Serhiy Smyrnovskyy; Zoryana Semeryak; Ivan Khomiak; Ivan Hlukhov (Montenegrin Sports Academy and Faculty for Sport and Physical Education, 2020)