Stands for Change Of Direction.
Concentric (muscle contraction)
Muscle shortens whilst moving resistance. It is the most common form of muscle contraction in human movement (and therefore in football as well). Evident in every action in football such as running, kicking, and jumpin
Describes the dependence between two variables, giving a value between r = +1 and −1. It is widely used in the sciences as a measure of the strength of linear dependence between two variables. Correlations can be trivial (0.0 < 0.1), small (> 0.1 < 0.3), moderate (> 0.3 < 0.5), large (> 0.5 < 0.7), very large (>0.7 < 0.9), and perfect (> 0.9 – 1).