Exercise Bike Navy students pedal through pain during a spin class at Eglin Air Force Base, Fla., May 21, 2014. Spin is a cardio-intense workout on a stationary bike. U.S. Air Force photo by Ilka Cole SHARE IMAGE: Download Image: Full Size (0.28 MB) Tags: Exercise Bike, All images, Fitness, exercise Photo By: Ilka Cole VIRIN: 160104-D-XT155-002.JPG Photo Gallery