Although positive effects are achieved by continuouslyContinuously performing preventive care and other health 1activitiescare activities, can have a positive impact; however performing the same activities every daydaily can becausealso result in a mental strain. Therefore, research hashave been 2performedconducted on maintaining the motivationways to consistently motivate and encouragingencourage3 them to use exercise systems by incorporating games wherein which the users can perform4 voluntary activities. On the other hand, tThe Kinect system developed by Microsoft is able tocan recognize people’s posturesa person’s posture and the three-dimensional coordinates of their joints,. and work has been done to 5rResearch and developdevelopment of systems that use a Kinect to measure hand and foot movements for rehabilitationfor rehabilitative purposes has6have been conducted7. Since the Kinect can detect real-world human postures,; therefore it can also be used to recognize antagonistic exercises. Recently, sSeveral Kinect-based commercial rehabilitation systems have recently been developed. FormerlyPreviously, we designed and developed a prototype lower-limb chair exercise support system usingthat uses a depth image 8sensor and evaluated theits performance and usability. The system recognizes and evaluates exercises based on 3D position data and joint angles for skeleton and red-green-blue (RGB)9 data obtained from the Kinect sensor. In this studythe present study, we designed, implemented,10 and evaluated a system that supports antagonistic exerciseexercises using a depth sensor. It The system recognizes exercises by using skeleton data about11on the user’s joints acquired from a depth sensor,12 and evaluates the user’s exercises to provide real-time feedback. This systemIn addition, it uses an audiovisual display to explain the exercise procedures to the user, and displays user’splays their 13real-time video to encourage the userusers to perform the exercisesexercise. It also has a rhythm game function whereby the user can exercise in timesync with music. This system incudes is provided with fourFour types of exerciseexercises are included with this system: upper/lower limb antagonistic movement, upper limb left/right antagonistic movement, rock/paper/scissors using both arms and both legs, and duple/triple time exercises.