People who are active and fit have fewer, milder colds, says US-led research. The study concluded that exercise sparks a rise in immune system cells circulating around the body. Although these levels fall back within a few hours, each bout enhances surveillance of viruses and bacteria, so reducing the number and severity of infections. Fitness expert Roger Love of Love London Fitness, agrees: "Feeling sniffly? Try walking at a speed where you're slightly out of breath and would struggle to hold a conversation. Keep hydrated. As you cool down, pop another layer on, and eat within an hour to get your energy levels up. Never exercise if you have flu or are running a temperature, as your body needs all its reserves to fight infection."
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