Photo illustration of what not to wear (left) and what should be worn (right) when working out at the Dover Air Force Base fitness center. Athletic clothing and shoes are required. The policy is necessary, especially in the winter months, to prevent salt from being tracked on to the fitness equipment and athletic courts which results in damage and injuries to personnel. (U.S. Air Force photo/Greg L. Davis, U.S. Air Force graphic illustration/SrA. Jared Duhon)
Salt put down on roads and sidewalks to melt ice is frequently tracked in to the fitness center on peoples' work boots. Wearing boots during a workout, as shown here on a treadmill, is against fitness center policy because the dirt and salt can damage the equipment and make the floors slippery. (U.S. Air Force photo/Greg L. Davis)
Airman 1st Class David Scott-Gaughan, a broadcaster with the 436th Airlift Wing Public Affairs Office, carries his clean athletic shoes and workout clothes into the Dover Air Force Base fitness center on Feb. 12, 2014. The center has a two-shoe policy which mandates work boots or shoes cannot be worn in the facility to prevent dirt and salt from being tracked onto the fitness equipment and athletic courts. (U.S. Air Force photo/Greg L. Davis)
A pair of athletic shoes sit next to a pair of boots inside the Dover Air Force Base fitness center locker room on Feb. 12, 2014. The center has a two-shoe policy to prevent dirt and salt from being tracked onto the fitness equipment and athletic courts which results in damage to equipment, facilities and injuries to personnel. (U.S. Air Force photo/Greg L. Davis)