en بيومکانيک ورزشی و شاخه‌های وابسته بدان Sport Biomechanics and its related branches مقاله اصیل Original Article <div style="text-align: justify;"><strong>Background. </strong>The butterfly stroke, renowned for its technical complexity, demands a unique interplay of strength, power, and coordination. While previous research has explored the biomechanics of elite butterfly swimmers, limited attention has been given to understanding the relationship between specific kinematic parameters and physical fitness in proficient but non-elite swimmers. This study addresses this gap by investigating the associations between swim velocity, stroke rate, and stroke length over a 25-meter distance with key physical fitness attributes in male college students.<br> <strong>Objectives.</strong> This study aims to determine the relationship between select kinematic parameters of the butterfly stroke and physical fitness in male swimmers, focusing on the analysis of swim velocity, stroke rate, and stroke length over a 25-meter distance.<br> <strong>Methods.</strong> The study group comprised seventeen male proficient butterfly swimmers enrolled in a physical education program. Baseline measurements of muscular strength, muscular endurance, speed, flexibility, and agility were collected during a pre-test to assess participants&#39; physical fitness. Data were analyzed using means, standard deviations, and Pearson correlation coefficients to examine the relationships between these fitness parameters and the kinematic variables of swim velocity, stroke length, and stroke rate.<br> <strong>Results.</strong> A significant positive correlation was observed between stroke length and muscular strength in butterfly swimming (p<0.05). Additionally, positive correlations were found between swim velocity, stroke rate, and speed p<0.05.<br> <strong>Conclusion. </strong>These findings suggest that muscular strength is a crucial determinant of stroke length, highlighting its importance for efficient butterfly swimming. Furthermore, the positive correlations between swim velocity, stroke rate, and speed underscore the interconnected nature of these variables in overall performance. Swimming curricula should emphasize the development of muscular strength and speed-focused training to optimize the kinematic characteristics of the butterfly stroke in physical education students.</div> Swimming Performance, Kinematic Analysis, Physical Fitness Training 0 0 http://aassjournal.com/browse.php?a_code=A-11-2051-3&slc_lang=en&sid=1 Ha Minh Diu minhdiuha79@gmail.com 100319475328460015254 0009-0000-8436-372X No Department of Physical Education, Hanoi Pedagogical University 2, Vinh Phuc, Vietnam Dao Chanh Thuc dcthuc@agu.edu.vn 100319475328460015255 100319475328460015255 Yes An Giang University, Vietnam National University, Ho Chi Minh City, Vietnam