EXAMINATION OF PHYSICAL FITNESS PARAMETERS BETWEEN PROFESSIONAL AND AMATEUR GREEK SOCCER PLAYERS DURING THE TRANSITION PERIOD. - BEKRIS, EVANGELOS; PIDOULAS, GEORGIOS; PIDOULAS, PANTELIS; GISSIS, IOANNIS; KATIS, ATHANASIOS; KOMSIS, STERGIOS (Journal of Strength & Conditioning Research, 2021)