(iStock ) "Every bout of exercise enhances circulation of key immune cells," says lead author David Nieman, Dr.P.H. Steady-state cardio or circuit training is best, because rest periods during interval and strength training may curb the cold-fighting effect of exercise.
How to Stay Healthy This Winter
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JANUARY 24, 2013
Paige Greenfield, Yahoo Health

Those sweat sessions not only fight winter flab but also buff up your immune system. An Appalachian State University study found that people who exercised at least 5 days a week took 43 percent fewer sick days due to colds in fall or winter than their lazier peers.
Read more: Yahoo Health