Strains, sprains at peak during summer heat
Senior Airman Adam Baker, 1st Special Operations Civil Engineer Squadron water and fuels systems maintainer, and other Airmen execute dynamic stretching before beginning physical fitness training on Hurlburt Field, Fla., July 18, 2014. Dynamic stretching uses controlled leg movements to loosen up muscles and increase heart rate, body temperature and blood flow. (U.S. Air Force photo/Senior Airman Kentavist P. Brackin)