Reaching for fitness by Aerotech News • October 16, 2015 4:08 pm - Updated April 21, 2020 2:35 pm Nicole Harris, Warrior Fitness Center fitness instructor, holds a side-plank at the WFC on Nellis Air Force Base, Nev., Oct. 14. The plank exercise targets the obliques, quadriceps, hamstrings, abductors and adductors.