Welcome to 4 weeks of fun indoors! This training plan came about during the COVID-19 crisis to help athletes who had to stay inside remain fit and be challenged while doing it, but can also be used if you just want a month of "unstructured structure", read: still have a plan, but not necessarily a race goal to get to. You found this plan, so of course, I don’t need to tell you that staying active as much as you can is now more important than ever. Moderate exercise can strengthen the immune ...