It’s that time of year. Everyone around you is getting sick. Again. Those who were once your family, friends and colleagues are now the enemy. They’ve become evil germ zombies from The Last of Us come to destroy your gains and screw up your perfect rhythm of work and life. Like death and taxes, it happens to us all and despite your best efforts, you may get sick at some point. I am frequently asked whether working out will help or hurt when under the weather. So I’m sharing my go-to references for deciding.