Echocardiograms would be a better choice perhaps?
Both really should be done together. And EKG can look normal enough, but an echo tells the story mechanically. An echo can look normal but if an ekg is abnormal in a youngster then that’s it...no strenuous sports unless a correctible cause is found...electrolyte imbalances or thyroid issues perhaps.
So, both should be done prior to entry to strenuous sports programs, in order to get a good accurate picture.