I came across an interesting article online about working out when you are sick. I would like to share some of the interesting points here. Whether to work out or not depends on your body status, not on how determined or eager you are to work out. The basic criteria for determining if it is okay to work out lightly when you are sick is if the symptoms appear above or below your neck. If the symptoms appear below your neck, you shouldn't workout. This famous criteria is called the "Neck Rule." The symptoms above your neck are as follows: 1)You have a stuffy nose, like you are coming down with a cold. 2) You feel a bit of discomfort around your throat but you don't have strong pain or don't have a fever. 3)You have a mild headache. Sometimes working out may make you feel better in the case where the symptom comes from stress and lack of sleep 4)You have hay fever. You can basically exercise. However, you should avoid exercising when you have difficulty breathing. On the other hand, you must not work out if you have the following symptoms: A)You have a fever over 37.5 degrees. Immune system is working and exercising is counterproductive. B)You feel very fatigued. It is very dangerous to workout under these circumstances C)You can't stop coughing. Your lungs and bronchi may be inflamed. D) You have pain in your chest and are out of breath. These are very dangerous situations to exercise. You must get some rest. So, you can ask yourself the questions below to judge if you are not feeling well Q1)Do you have appetite? If no, skip work-out. Q2)Do you get much sleep? If no, skip work-out Q3)Do you think you will be able to recover if you exercise? If no, skip exercise. I usually go to the gym once a week to work out. So, I'm a bit worried if I wasn't able to go to the gym all week because I feel like muscle loss happens quickly when I stop training. However, this is the wrong approach to exercise.