It is difficult to reproduce actual movements in a space with restrictions on environmental aspects, such as a rehabilitation room. Therefore, it is possible to understand functional decline in athletes by understanding the basic movements that constitute sports behavior and analyzing the subdivided movements (F task: Function task). The point of segmentation is to focus on the phases of switching movements considering mechanical energy; improving the F task will have a positive effect on sports movements in the field, which cannot be performed in the rehabilitation room. This paper presents examples of F tasks for running, throwing, jumping, turning, and thoracic extension movements.