Here are the things you need to be able to do to be a Washington Nationals ballgirl

via MLB Team Jobs:

Baseball Knowledge:Fielding foul balls and getting out of the way of fair ones, it is important to know the difference between the two. Also knowing when to retrieve the pitchers’ jackets from the bullpen to run to the dugout. 

Fan Interaction:Interacting, motivating and energizing Nats’ fans at all designated Nationals home games through the giving of foul balls to kids and Nats fans. 

Gameday Setup and Breakdown:Arriving on time and making sure uniform is clean and neat, stool is clean and in working order and helmet is clean. 

Other:Assisting with other on-field activities as needed (Presidents Race, t-shirt toss, etc.).
Education, Experience, Skills, and Abilities 

Required: (critical to successful job performance)Prior experience in softball a plus.
Must be reliable, able to arrive at Nationals Park at least 60 minutes prior to gametimes, punctual, courteous, and have good listening and multi-tasking skills.
Ball Girls must display professionalism whenever they are wearing their uniform, as they are brand ambassadors for the entire Washington Nationals organization.
Strong ability to work well with co-workers and supervisors in a team environment and professional manner.
Must have the physical ability to perform athletic activities in all weather conditions, including running around the warning track.
Must be able to lift and carry items up to 50lbs.
Must be available to work during all Nationals home games, including days, nights, weekends and holidays.