The eventual goal of this study is to establish a method to enhance implicit embodiment and support for creation of expression with others. As a first step, we studied how implicit embodiment relevant to the creation of expressions is represented in the body movement during Hand Contact Improvisation. Specifically, by building a system that measures movements of the entire body in the process of hand contact improvisation, experiments were carried out using skilled person of improvised bodily expressions as subjects. From the results, it was inferred that implicit embodiment is activated and both skilled performers. Next, we have focused on fluctuation as a means to enhance implicit embodiment. Hence, a device was developed to present load fluctuation to the hands of test subjects arbitrarily. Effects of load fluctuation were evaluated using measurement results of the entire body and subjective evaluation. The results suggested that by presenting a fluctuation which has little effect on the consciousness, implicit embodiment of performer can be activated.