Like a tornado through his body
Mark Ivanisin, a U.S. Army Corps of Engineers Pittsburgh District operations supervisor for navigation on the Allegheny River, walks on a treadmill during a physical therapy appointment to strengthen his lungs and body at a pulmonary rehab center in Warrendale, Pennsylvania, Dec. 17, 2021. “I never thought something as simple as walking at this pace would be so hard,” he said. Earlier this year, Ivanisin spent 52 days in the hospital fighting for his life against the COVID-19 virus and the pneumonia that followed. (U.S. Army Corps of Engineers Pittsburgh District photo by Michel Sauret)

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Photo by: Michel Sauret |  VIRIN: 211217-A-TI382-0135.JPG