“…Ten of the studies included one sport [ 8 , 9 , 13 , 14 , 16 , 18 , 19 , 20 , 22 , 25 ], and the other four included two to six sports in their program. Concerning the program duration, 11 studies examined one season [ 8 , 9 , 13 , 14 , 15 , 16 , 18 , 19 , 20 , 22 , 25 ]; Gil-Arias, Harvey, Cárceles, Práxedes, and Del Villar [ 21 ] investigated two seasons; Wallhead, Garn, and Vidoni [ 23 ] investigated four seasons; and Choi, Sum, Leung, Wallhead, Morgan, Milton, Ha, and Sit [ 24 ] investigated seven seasons. The season length ranged from 8 to 25 lessons, lasting from 5 to 16 weeks.…”