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Associated Press
In this photo provided by the Wake Forest Baptist Medical Center, taken March 11, 2015 in the intensive care unit at Wake Forest Baptist Medical Center, physical therapist Katie Kellner helps patient Terry Culler do some exercises and briefly stand despite being hooked to a ventilator. There's increasing evidence that mild exercise may have its place even for the sickest ICU patients, and new animal research suggests it may target both muscles and lungs. (AP Photo/Warren Cameron Dennis III, Wake Forest Baptist Medical Center)

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