“…The trend of recent years shows an increased duration, intensity, and difficulty of training, a high-frequency participation in sports events, and an earlier specialization and professionalization (Mountjoy et al, 2008 ; Caine, 2010 ; Armstrong and Mc Manus, 2011 ). Such conditions can negatively affect the risk of physical and psychological illness and injury (Armstrong and Mc Manus, 2011 ; Sabato et al, 2016 ). Therefore, to ensure resilience in young athletes, age-based additional endo- and exogenous risk factors, which can negatively influence the ability to withstand stress, should be known and considered: e.g., physical development, high training load (DiFiori and Mandelbaum, 1996 ; Dennis et al, 2005 ; Dun et al, 2005 ; Loud et al, 2005 ; Fleisig et al, 2011 ; Hjelm et al, 2012 ), early specialization (Barynina and Vaitsekhovskii, 1992 ; Bompa, 1995 ; Jayanthi et al, 2013 ), performance capacity, previous illnesses, environmental factors, and negative stressors such as school, parental conflicts, pressure to perform, and competition failure (Cohn, 1990 ; Scanlan et al, 1991 ; Puffer and McShane, 1992 ; Gould et al, 1993 ; Puente-Diaz and Anshel, 2005 ).…”