Great post! There are tons of wonderful resources that are freely available. Many professional trainers are offering indoor workout videos on YouTube at the moment. There are options for every health level, age and style. Yoga, cardio, strength, core, etc. There are workouts for people suffering from specific conditions or injuries. The goal is simply to move in some way every day. It is so wonderful for the immune system, the mind and the spirit. Movement can go a long way to help us process the emotions many of us have been struggling with lately.

Yaowen, vitamin D has many benefits. It would not surpirse me if it benefited our immunity in the way you describe. Sunshine for everyone! (Within reason of course). If you cannot get outside there are supplements. You'll need to take it alongside calcium for proper absorption.

Thanks Blue!