1. They receive extensive training in weapons and "water survival skills"
This team has to do a little more than run laps to qualify. There are several steps to the training, and it never truly stops (agents protecting the president go through refresher courses every eight weeks to stay sharp). But obviously, there's a lot of practice with guns, including revolvers, shotguns, and Uzis, a weapon the Secret Service still legitimately uses, according to Emmett. Agents must also be able to jump in and out of the president's follow-up car while it's moving. They further need to be versed in emergency medicine and "water survival skills," presumably due to the many seabound state dinners.
2. The president can assign Secret Service protection to anyone
Certain people get agents no matter what -- the president, the vice president, the rest of the First Family, former presidents, etc. -- but technically, anyone can receive Secret Service protection. The president just has to order it. Some past examples include Ted Kennedy, who got a detail while he stumped for Walter Mondale in 1984 because of his family history, and Rajiv Gandhi, who got agents the same year when he visited New York, also due to his family history and direct threats.