I would consider being hospitalized to qualify for "sick to any serious degree".
What exactly do you think that graph means? What we'd like to know is the odds of getting infected, and if infected, the odds of it being serious... for an athlete... and you can't get anything from that graph. Way more 18-49 year olds than any other group shown for starters.
To the OPs question I see little reason for intense workouts now since there are no races.
I think that it clearly illustrates that there is little to no practical visit in hospitalizations for the age group that the previous poster stated were at a lower risk.
I do not read anything further into it.
Assuming that you are in a "safe group" is like suggesting that it's safer to ride without a helmet because you can hear the traffic better. There are no safe groups.
Many, however, are looking for permission to retain a "normal" life based on fitness status (or other metric). I am not aware of concrete evidence to support this. I am also not willing to assume, hope, or wish that this is the case.
I feel that my risk of infection and complications therein are equal to all those around me, despite my age and fitness level.
I have friend who raced ultra-marathons and adventure races who is on supplemental oxygen 24/7 despite being 3 months post "recovery" (infected while caring for patients). I have an aunt who has died.
This is not changing my training, but it has changing my actions.
The above poster is a physiologist employed by PEARL iZUMi. However, statements are not made on behalf of nor reflective of PEARL iZUMI in any manner... unless they're good, then they count.