caption: U.S. Air Force Staff Sgt. <PERSON>, 355th Equipment Maintenance Squadron, strengthens his knee with an elastic band exercise at the Physical Therapy Clinic on Davis-Monthan Air Force Base, Ariz., May 16, 2012. An elastic band can provide the right training, in which it may prevent muscular imbalance that causes injury. (U.S. Air Force photo by <PERSON> <PERSON>/Released)
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