Objective: To investigate the effects of constant-width and varied-width parachute running training on the 100-meter sprint performance of athletes from the North Medan Athletic Club in 2023 and to determine which training method is more effective. Methods: The entire population of 10 athletes from the North Medan Athletic Club was analyzed. The athletes underwent pretest and post-test measurements for their 100-meter sprint times. They were divided into two groups: one group was trained with constant-width parachute running, and the other group was trained with varied-width parachute running. Pretest and post-test data were analyzed using SPSS 21. Normality tests were conducted to ensure data distribution. Homogeneity of variance was tested to compare the variances between the two groups. A t-test was used to determine the significance of the differences in sprint times before training and after training, as well as the difference between constant and varied-width training. Results: All data were normally distributed and showed homogeneity. The t-test showed a statistically significant improvement in sprint times for athletes in both the constant-width (p < 0.05) and varied-width (p < 0.05) parachute running groups. Furthermore, a significant difference was found between the constant-width and varied-width training methods, with varied-width training showing a greater effect in increasing the sprint speed of athletes at the North Medan Athletic Club.

The existence of child exploitation and child labor will add to labor problems in Indonesia. The term "child labor" refers to people who employ children. The term "child labor" can be associated with the use of children's labor with low compensation or considerations regarding their personality development, safety, health, and future prospects. Most child workers do not have time to play or go to school like other children. Underage people work as hard as adults, both in formal and informal jobs. To save child labor in the future, a holistic and comprehensive solution model is needed. One method that can be used is a client-centered case management approach (centered on the client or child worker).