Exercise Enhances Immunity — But Intense strenuous Exercise, Increases Cortisol levels, which in turn suppresses Immunity. Yoga is The Best Solution. Yes, Even Moderately Stressful Exercise, Increases Cortisol levels, which in turn suppresses Immunity.
Mild, Non-straining, Non-Stressful, Slow, Exercise — doesn't stimulate Cortisol secretion. So if Immunity is the real concern, as in this Corona Pandemic .Go for yoga or slow Aerobics. This is proved in a Japanese Study.