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Purpose: The purpose of this study is to investigate the effects of varying training speeds on pulmonary function and posture improvement in patients with rounded shoulder posture using horseback riding equipment. Methods: A total of 27 participants were evenly divided into three groups according to the intervention method: low-, medium-, and high-speed training. Each group engaged in a daily 21-minute session on horse riding training equipment. Pulmonary function, abdominal pressure, and the length of the pectoralis minor muscle were measured both before and after the sessions. Pulmonary function was assessed using the AVAD9 system, abdominal pressure was measured with a stabilizer, and the length of the pectoralis minor muscle was determined using a tape measure. The pulmonary function metrics included forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), and peak expiratory flow (PEF). Results: A comparison across low-, medium-, and high-speed movements revealed that all three groups experienced changes in the length of the pectoralis minor. However, significant differences in FEV1 and PEF were observed in the medium-speed group. Conclusion: The medium-speed exercise group exhibited significant improvements in pulmonary function and posture alignment compared with both the high- and low-speed groups.