Exercise will assist to promote circulation; attempt to maintain a schedule of modest activities to enhance blood flow to the tissues, such as pointing your toes, rotating your feet, and wriggling your toes. These actions can help remove tissue toxins that may build up when you are exposed to cold temperatures. Chilblains are painful lesions caused by constricted blood vessels in the skin. Exercise will increase your body temperature, which could cause or exacerbate chilblains if you're not careful. You should avoid excessive heat exposure and take it easy during exercise. If you have chilblains, stop exercising until your doctor gives you the all-clear. Otherwise, you risk hurting yourself by doing too much activity too soon after suffering from the condition.