First Lt. Alex Johnson, 23rd Expeditionary Bomb Squadron electronic warfare officer, chalks his hands to prepare for muscle-ups Oct. 21, 2015, at Andersen Air Force Base, Guam. Johnson does functional fitness at least five times a week, and follows a program that guides him during his daily exercises. ( Air Force photo by Airman 1st Class Arielle Vasquez/Released)

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Size: 5670px × 3780px
Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: fitness, regimen, strength