In the introduction the constraints that affect the skill should be included, like the size of the circle and angle of the sector for the discus, height of the mound and distance from home plate for pitching in baseball. It is essential that there be diagrams showing the phases of the skill. These diagrams should include the total sequence very near to the introduction of the paper. In each of the phase sections you should include diagrams showing at least the positions at the beginning and ending of the phase. Other diagrams showing the application of forces, the muscles that are active or other features of the skill really assists the reader in understanding the analysis.
Analyses are complicated.
Words do not adequately describe the motion. This is the same with this paper. You want to be understood. Throwing complicated concepts out without proper application, explanation nor diagrammatic examples is futile, and a source of failure to communicate. The motor skill of your choice must be approved by your instructor.