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The purpose of this study was to investigate the effects of applying a functional pillow of body classification on elderly persons’ neck muscles and range of motion. Twenty-five subjects aged >65 years participated in an 8-week program that included applying a functional pillow of body classification. Neck muscle function was measured by using Myotone (Myoton AS, Estonia) at pre-intervention, at 4 weeks of the intervention, and at 8 weeks after the intervention. The subjects’ neck ranges of motion changed significantly between preintervention and after 8 weeks. Furthermore, the splenius muscle significantly changed after using the functional pillow of body classification and there was an improvement in the subjects’ neck ranges of motion and muscle functions. Based on these results, we conclude that using a functional pillow of body classification improved neck range of motion and neck muscle function, which led to the improvement of body posture and muscle functions.