We have developed a biofeedback-based breath training environment in which the user can easily relax his body and mind only by following the induction. The environment includes body relaxation video guide and breathing induction program. The body relaxation video guide helps relax the body with simple stretch motions in a seating posture. The breathing induction program is operated in two modes: biofeedback training mode and self training mode. In the biofeedback training mode, a visual breathing induction is provided and each breath following the induction is assessed by processing the change of pulse rates measured from photo-plethysmography. In self-training mode, voice and visual induction is provided to breathe consciously in a natural posture without any physical restrictions such as sensor contact and visual induction eye tracing. The environment is also equipped with a breathing test function. The breathing test evaluates current breathing habit to recommend an optimal breathing guide.