In this paper, we propose a new concept of treadmill, that is, personalized sportainment treadmill. The personalized sportainment treadmill is a new system which gives personalized entertainment services in a treadmill. It can be configured with user recognition technology, mixed reality-based interactive content, mobile-treadmill synchronization technology, and more. Among them, user recognition technology and the mixed reality-based interactive contents are very important for users to give an immersive experience. So, we designed and proposed face recognition, gesture recognition, interactive virtual trainer and gamification technologies in this paper. With these technologies, the personalized sportainment treadmill system will give a immersive experience to users.