I am a retired radiologist (not cardiologist or infectious disease specialist) but read a radiology newsletter several days per week.
Myocarditis is often diagnosed via MRI scans ..don't know for sure but my educated guess is that young non-athletes would suffer this complication at about same rate as athletes. Remember this virus has only been around for less than a year so there is a lot yet to be learned about long term consequences. Based on radiology literature there are many potential chronic issues (lung, heart, brain, kidneys) but college age kids would be less susceptible than the 60+ age population.
BTW don't forget what happened to Ryan Padgett..he is 45 years old and presumably in good health and COVID almost killed him