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 Don't Sleep, Stretch Friday, October 31, 2003; 11:50 AM Airplane travel can be a real pain in the back, neck, shoulders and legs. Plane flights can cause stiffness, muscle cramps or even, according to the American Heart Association, blood clots. Don't just sit there; do something, says Chicago-based personal trainer Michael Sena, who dispenses travel fitness tips on United Airlines in-flight videos. Sena demonstrates exercises aimed at alleviating potential health problems when taking long flights.
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