To become a Secret Service agent, recruits must pass these training exercises

According to this New York Times article, the Secret Service needs more members:

...John Roth, the inspector general for the Department of Homeland Security, said last month as he laid out the Secret Service's personnel shortfall at a hearing on Capitol Hill. Mr. Roth estimated that the agency needs to increase by 1,700 employees in five years, to 8,200, if it is to properly perform its investigative and better-known protection missions.

To show exactly what it takes to become (and remain) an agent, the Times went into a Secret Service training facility in Maryland. They filmed recruits performing the five rigorous training exercises they must pass: Physical training, control tactics, firearms (this course alone is 104 hours long), K9 and emergency response, and protective driving. The video is another one of those 360 degree ones.