BOSTON (June 30, 2007) Swimmers prepare for the first leg of the Navy SEAL Trident Challenge at Boston University during Navy Week Boston. The challenge mirrors the initial physical screening test given to those interested in becoming a SEAL and consists of swimming, push-ups, sit-ups, pull-ups, and running. The Navy SEAL Trident Challenge was just one of many Navy sponsored events in Boston during Navy Week. (US Navy photo by Chief Mass Communication Specialist Dave Kaylor/RELEASED)

[Image courtesy of the US Navy Website.]