Purpose The purpose of this study was to investigate the effects of a Bobathbased quantitative intervention, incorporating isometric and eccentric contractions of the gastrocnemiussoleus muscles, on balance and gait in a patient with stroke. Methods This study employed a singlesubject research design with a 72yearold male patient with right side hemiplegia. The intervention, performed three times per week for three weeks, consisted of a structured heel raise exercise. Each repetition included a concentric contraction, a 2second isometric hold at the peak, and a 4second controlled eccentric lowering. The protocol was performed for 10 sets of 5 repetitions per 30minute session. Outcomes were measured using the Timed Up and Go (TUG), Berg Balance Scale (BBS), 6minute walk test (6MWT), and 10meter walk test (10MWT). Results After the intervention, the patient demonstrated improvements across all measures. Balance ability improved, as shown by a reduced time in the TUG and an increased score on the BBS. Gait performance also enhanced, with an increased distance in the 6MWT and a decreased time in the 10MWT. Notably, the patient's assistive device was changed from a walker to a quad cane. Conclusion A quantitatively structured intervention targeting the paretic calf muscles, based on the Bobath concept, was effective in improving balance and gait in a patient with stroke. This suggests that applying a clear, reproducible protocol based on specific contraction types and durations can be a viable clinical approach to enhance selective motor control and functional mobility.