Simplify the following text for a Grade 4 native English-speaking person.
Original: A training camp is a place , usually with an army-camp-type environment , where people go to learn skills , usually skills involving physical action rather than book subjects , usually for an armed force or an action sport .
Simplified: A training camp is a place where people go to learn skills . Often , they go there to learn physical action , rather than book subjects they would learn at a school .