Fitness experts caution against jumping into a difficult routine suggested by Robert F. Kennedy Jr. and Pete Hegseth.

The Navy officially established the SEAL program in 1962, with the credit historically going to President John F. Kennedy, who had been a naval combat officer himself.

May 3, 2011 -- U.S. Navy SEAL Team Six is an elite team of military personnel trained to conduct the most top secret operations involving combat, anti-terrorism and dangerous rescues.