Class participants hop, lift, and push themselves through exercises during the High Intensity Circuit training class at the Semper Fit Center gym, July 9, 2013. (U.S. Marine Corps photo by Lance Cpl. Janelle Y. Chapman) - Class participants hop, lift, and push themselves through exercises during the High Intensity Circuit training class at the Semper Fit Center gym, July 9, 2013. (U.S. Marine Corps photo by Lance Cpl. Janelle Y. Chapman)