The Training Optimization of the Football Player’s Explosive Force by Means of the Data Provided by the Study of the Energetic Parameters - Ciobotaru, Oana; Voinescu, Doina; Ciobotaru, Octavian; Ciocan, Nicolae; Savu, Cătălin (Annals of “Dunarea de Jos” University of Galati. Fascicle XV, Physical Education and Sport Management, 2014)