You have a cold. Thus, you should take the day off from the gym and rest at home. This is yet another one of the myths about the common cold. Whether or not you should continue with your fitness routine (or go outside and resume your normal day’s tasks) depends on how your body feels. It’s important to listen to what your body is telling you. In general, it’s safe to work out with a common cold. However, you must keep the following in mind: cover your mouth when you sneeze or cough and wash your hands properly before and after you exercise to prevent the spread of the virus.