7 secrets of kids who rarely get sick

2. Encourage physical activity every day.

Scientists haven't determined exactly why regular, moderate exercise seems to reduce cold and flu episodes, but they speculate the activity boosts the circulation of infection-fighting cells. Other theories include that the rise in body temperature prevents bacterial growth and that exercise slows down the release of stress-related hormones.

The Canadian Physical Activity Guidelines recommend 60

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2. Encourage physical activity every day.

Scientists haven't determined exactly why regular, moderate exercise seems to reduce cold and flu episodes, but they speculate the activity boosts the circulation of infection-fighting cells. Other theories include that the rise in body temperature prevents bacterial growth and that exercise slows down the release of stress-related hormones.

The Canadian Physical Activity Guidelines recommend 60 minutes of moderate-to-vigorous physical activity every day for all kids, toddlers through teenagers.

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