http://www.usmarshals.gov/careers/fitness_men.html
For our standards, I would encourage an applicant, at a bare minimum, to meet or exceed a rating of "good" commensurate to the appropriate age group.
Providing the name of your academy, or at least, the area of the globe you are in, would be helpful to give you a more accurate assessment.
"Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same, or one day we will spend our sunset years telling our children and our children's children what it was once like in the United States where men were free" -- Ronald Reagan