The U.S. Air Force Critical Days of Summer campaign kicked off May 23 and runs through Sept. 2. According to the U.S. Air Force Safety Center, during summer 2013 105 mishaps resulting in injury were reported across the Air Force due to improper stretching or warming-up. More than 10,000 adults and approximately 715,000 students suffered sports and recreation injuries in 2013. (U.S. Air Force photo by Airman 1st Class Areca T. Wilson/Released)