Use of compliance in muscle is the inherent skill of a human. By using the potential energy charged in the compliant members, we can skillfully equalize the characteristics of muscles and body. Integrating the skill of compliance will provide robots with higher mobility, dexterity and safety and extends the fields of applications. The main research issues of the skill of compliance are tuning passive compliance, planning compliant motion and designing control law. To achieve the skill, we focus on the planning compliant motion considering the kinetic energy. In this paper, we propose to design a compliant motion through iterative model identification and motion design. A humanoid robot with passive compliance is used to integrate the skill of compliance and shows fast swing charging and discharging the kinetic energy.