For example, there are certain kinds of arthritis and autoimmune diseases, or certain basic health problems like the common cold, where the immune system being too stimulated is part of the pathogenesis of the disease. So incremental change from where you are has to take into account, for instance, with the immune system, whether you want to stimulate now or not. The cold is an example. When you have a sore throat, fever, etc., the best thing you can do is stay hydrated and rest. However, after two or three days when the fever is less, but you still don't feel well, going out for a gentle walk may make you feel better earlier.
People often ask about the best time of day to exercise.
Our answer is the best time to exercise is the time of day when you will do it. People who exercise in the morning have the highest rate of exercise compliance, most likely , because when exercise is done early in the morning, other activities and daily life situations don't interfere and compete, as can happen if your exercise is scheduled, say at 5 p.m. So for compliance, morning may be optimal. However, if you're not a morning person, and try to force yourself in the morning, this may be a setup for failure. There's nothing that says you have to exercise in the morning.