The present invention relates to a user-participating type fitness lecture system and a fitness training method using the same. More specifically, the present invention relates to a user-participating type fitness lecture system that provides direction for correcting a user's posture or motion by comparing the user's motions with user created contents (UCC). When the contents are played back for the user to emulate, correctness of the user's motion is grasped by detecting and comparing motions in the contents with the user's motion photographed through a camera, and providing the user with posture correction information in image or voice formats. In one embodiment, a user-participating type fitness lecture system according to the present invention comprises a user terminal for photographing a user and transmitting a moving image of the user while playing back a UCC selected by the user; and a posture correction server for providing the user terminal with the UCC selected by the user, receiving the moving image from the user terminal, comparing the moving image with the played back UCC, and directing correction of the user's posture in voice or image.