The Zimmerman's execute planks as their youngest daughter sits between them during a circuit course in preparation for the BootCamp Challenge aboard Marine Corps Recruit Depot San Diego Sept. 6. "It's a great family activity," said Edward Zimmerman, a particpant in the training. "Our whole family comes out here and we have a lot of fun doing it together." - The Zimmerman's execute planks as their youngest daughter sits between them during a circuit course in preparation for the BootCamp Challenge aboard Marine Corps Recruit Depot San Diego Sept. 6. "It's a great family activity," said Edward Zimmerman, a particpant in the training. "Our whole family comes out here and we have a lot of fun doing it together."