When you have a cold, it is appropriate to engage in some light exercise, such as walking or slow strolling, and avoid vigorous exercise. Vigorous exercise can easily lead to physical fatigue, decreased immunity, and the possibility of secondary bacterial infections. Additionally, intense exercise can cause the sweat pores to dilate, making it easy to catch external pathogens, leading to or exacerbating symptoms such as fever and chills. You should drink more ginger tea, rest well, avoid spicy foods, and drink plenty of water. If fever symptoms are present, physical measures to reduce the fever should be taken, or antipyretic analgesic medications should be taken orally.