New swim program offers effective way to increase aerobic activity
U.S. Air Force Senior Master Sgt. Brian Senter, 355th Maintenance Operations Squadron, swims laps at the Benko Fitness Center indoor pool at Davis-Monthan Air Force Base. Ariz. Aug 15, 2013. Senter took part in the High Intensity Interval Training swim class offered every Thursday. (U.S. Air Force photo by Airman 1st Class Ariel Tumlinson/Released)