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30 minutes per day of walking, running or biking can halve the risk of contracting respiratory infections.
Regular exercise increases circulation of immune cells in your body.
But when you are sick your immune system must work hard to fight off the infection and physical activities make this task even harder.
WORDS
to halve: to divide something into two equal parts.
halve in other languages
to fight off: to avoid being harmed (e.g by an illness or unpleasant feelings).
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