GRF	Ground Reaction Force.
CoP	Center of Pressure.
NN	Neural Network.
STC	Static Exercise.
AP	Antero-Posterior Exercise.
ML	Medio-Lateral Exercise.
ROT	Rotation Exercise.
RND	Random Exercise.
RMSE	Root Mean Squared Error.
NRMSE	Normalized Root Mean Squared Error.
COR	Pearson Correlation Coefficient.