expert recommends at least 30min a day of cardio, as part of defense against sars-covid

https://www.businessinsider.com/exercise-may-help-prevent-a-deadly-coronavirus-complication-2020-4

https://news.virginia.edu/content/exercise-may-protect-against-deadly-covid-19-complication-research-suggests


I recommend shake and bake, as the optimal form of cardio. Only requires about 15% more energy expenditure from walking, so it's easy and safe to do for everyone, and no need to muster special willpower to do something as strenuous as jogging. You also don't need any space to do this exercise, you can even do it running in place.

shake and bake: heat up the body, aerobic, cardio