People with weak immune systems including the obese, and elderly probably should get flu or covid vaccines. Elon Musk said he and his kids were not at risk so why take preventative measures?
I regularly do cardio, get sunlight, eat mostly whole foods, lift weights, and drink very little alcohol and infrequently. I think my immune system is likely much stronger than a sun-deprived, obese sedentary guy who is vaccinated.
A lot of people who lift weights don't do cardio. Those people don't care enough about their health because cardio is actually more important than weight resistance training in regards to health.