Traditional virtual fitness systems employ mouse-or keyboard-based interaction operations and simple message delivery mechanisms. Most traditional fitness systems not only have problems in the user immersion and playability

but also lack scientific guidance of fitness strategies. In this paper

a personalized virtual fitness system design is presented based on natural interaction

highly personalized contents

and user-central feedback regulation model

which can improve the entertainment value of the fitness system and the effectiveness and scientificalness of fitness exercise. The fitness system design in this paper contains three fundamental elements

namely

semantic-based natural interface

highly personalized strategy

and user-central feedback regulation. The interface takes advantage of Kinect interaction equipment to strengthen the connection between a user and a computer with gesture semantics. The interface does not require any input of mouse or keyboard. Deeply customized strategy adequately considers the need of users and gives them personalization configurations with an interactive tool. Game rules and scene presentations can be freely changed by users. Feedback regulation uses a loop control among physiological signals

game show

and exercise strategy. The system monitors user condition and subtly visualizes it into the game show to gain a beautiful scene that users want. Therefore

users positively change exercise strategy. On the basis of system design

we further implement a virtual bicycle fitness system

which uses a fitness bicycle

a Kinect

a heart rate sensor

and a personal computer. This system collects wheel turning of bicycle

gesture information

and user heart rate in real time

and these signals are mapped into virtual 3D scene. The system generates a feedback regulation model among system scene

user heart rate

and exercise strategy

and a scientific fitness guidance is provided in real time. Then

users can adjust exercise strategy on their own

and the system scene can be personalized with gesture-based interactions without mouse and keyboard. Experimental results show that most volunteers are interested in the system

and the proposed design of virtual fitness system can improve the entertainment value of the fitness system and the effectiveness of fitness exercise for users. In this paper

a personalized 3D virtual fitness system design is presented based on natural interface

highly personalized strategy

and feedback regulation. Implementation of the system and results show that this system design has good effect on the entertainment value of fitness system and improves the effectiveness and scientificalness of fitness exercise.