It is important for beginners practicing sports motions such as tennis shots or baseball batting to check their own body movements and the correct movements of skilled players, and to understand the differences between them. However, checking each change in the features of a body part in motion, such as the position, orientation, movement speed, and rotational speed, is labor intensive. In this study, we propose a method for visualizing simultaneous changes in multiple features of one body part in one input motion with the spatial volume and flat arrows. In our method, the changes in the three-dimensional (3D) position and one-dimensional (1D) movement speed of a body part are simultaneously visualized as a spatial volume along the trajectory of the body part, the radius of which varies with the movement speed. In addition, changes in the 3D orientation of the body part and 1D rotational speed are visualized using flat arrows, the size of which changes according to the rotational speed. By generating these volumes and arrows for each motion of beginners and experts, users can easily check for changes in the features of body parts during these motions. In addition, users can identify problems in their own motion by comparing these. Finally, we present experimental examples of tennis shot and baseball batting motions.