The activPAL was more accurate than the ActiGraph GT3X+ in both sitting and standing activities except the activity of stationary biking. Both ActiGraph GT3X+ and the activPAL were also fairly accurate for classifying stepping activity when the stepping activity was determined by the formula created by 0.7 step/s threshold. It is expected that the result of the study would contribute to performing movement pattern analyses and health promotion research for posture classification.