Gopher baseball players running to the outfield and back

[Gopher2017]

Does anyone know why certain players, perhaps the same players (?), run to the outfield wall and back after every inning? Thanks in advance.

 

[BoogeyMan]

Just trying to stay loose throughout the course of the game. Most, if not all of those who are doing the running are not currently in the game and need a way to stay loose in case they are put into the game.

 

[Gopher2017]

Ah, that makes sense. I didn't know if there was some 'tradition' behind it which is why I asked. Thanks for the reply.