Journal of Sports Science and Physical Education 6(2): 36-44, 2017 – This study was conducted to determine and compare the fascicle behaviour during step forward lunge (SFL) and jump forward lunge (JFL) in badminton. Fifteen university badminton players (mean age = 22.07 ± 1.39 years old) were recruited and were assigned to perform SFL and JFL while holding a badminton racquet using their dominant hand. Fascicle length, pennation angle, lengthening and shortening velocity of their vastus lateralis muscle were analysed using ultrasonography method. In both dominant and non-dominant lower limb, FLmax, FLmin, PAmax and PAmin were all greater during JFL compared to SFL, p < 0.001. During both SFL and JFL, all the fascicle behaviour variables were greater in the dominant limb compared to non-dominant limb. To conclude, as the fascicle behaviour response would indicate more muscle adaptation, the stimuli were found to be greater during JFL compared to SFL.