<![CDATA[Agility is a key physical component in badminton because players must accelerate, decelerate, change direction, maintain balance, and return to a ready position within a very short time. This study aimed to analyze the relationship between body mass index (BMI) and agility among students participating in a badminton extracurricular program at SMAN 1 Kediri. A quantitative correlational design was used with total sampling involving 30 active participants. BMI was obtained from direct measurements of body weight and height and recalculated using the formula body weight in kilograms divided by height in meters squared. Agility was measured using the Illinois Agility Run Test and recorded in seconds. Data were analyzed using IBM SPSS Statistics through descriptive statistics, Shapiro–Wilk normality testing, scatterplot examination, and Spearman correlation because agility time was not normally distributed. The participants had a mean BMI of 21.75 ± 3.13 kg/m² and a mean agility time of 18.74 ± 2.58 seconds. The BMI data were normally distributed (p = 0.147), whereas agility time was not normally distributed (p < 0.001). Spearman correlation showed a significant positive relationship between BMI and agility time (rho = 0.667; p < 0.001). Because agility performance was evaluated based on completion time, this positive correlation indicates that higher BMI tended to be associated with longer test completion time and lower agility performance. These findings suggest that BMI monitoring can be used as an initial component of physical condition evaluation in school-based badminton training, although agility should also be interpreted alongside speed, lower-limb strength, balance, coordination, and training experience]]>
