Figure 1. Graphical description of the Y-Agility Test and Illinois Change of Direction Test (ICODT): A) The Y-Agility Test is performed in two phases: In the first phase (Y-PLAN), the participant is asked to sprint as fast as possible along a path in a pre-determined direction (left or right), as indicated in figure. In the second phase (Y-REAC), the participants perform the same sprint, but they do not know which direction to follow, and they have to visually find the illuminated gate that is activated by photocells positioned 2.5 m after the start gate. Y-REAC — Y-PLAN = REAC INDEX. B) In the Illinois Change of Direction Test (ICODT) the participant has to run as quickly as possible, performing a slalom through the markers and following the planned route indicated in the figure.