Stock Photo - NASA astronaut Shannon Walker, Expedition 25 flight engineer, poses for a photo while performing routine in-flight maintenance (IFM) on the Combined Operational Load Bearing External Resistance Treadmill (COLBERT) in the Tranquility node of the International Space Station.

Stock Photo: NASA astronaut Shannon Walker, Expedition 25 flight engineer, poses for a photo while performing routine in-flight maintenance (IFM) on the Combined Operational.

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