Airman 1st Class Nicole Rent, 703d Aircraft Maintenance Squadron aerospace maintenance apprentice, stretches in a PiYo class at the Elmendorf Fitness Center, Joint Base Elmendorf-Richardson, Alaska, March 22, 2016. Exercising while pregnant is helpful because it promotes better posture, improves endurance, and reduces backache. (U.S. Air Force photo by Airman 1st Class Christopher R. Morales)