Fears of a Covid-19 coronavirus pandemic are a timely reminder that regular exercise as part of a healthy lifestyle is still one of our best defenses. If you’ve been following the news, you know the drill: wash your hands thoroughly, cough or sneeze into a tissue or your elbow, clean surfaces thoroughly, self-isolate if you think you’ve been in contact with an infected person. Until a vaccine is developed, these are the recommendations for preventing the spread of Covid-19. However, if you’re reading this, the good news is that you are probably already doing the very best thing you can to boost your immune system and prepare your body to fight disease – exercising. As we have reported before, if exercise was a pill it would be regarded as a wonder drug, the best medicine, so powerful are its known effects to improve everything from general wellbeing to musculoskeletal disease to cardiovascular problems to diabetes, multiple sclerosis, mental health, anxiety and depression. So, aside fr...