Which Soccer Game Role?

Zhang Peng and John Baker will join a soccer game next week. The coach gives them two positions, forward and goal keeper. Which position will Zhang Peng choose?

The coach asks John Baker to be the goalkeeper because he is thin and tall. But John isn't sure if he can be a good goalkeeper. He really wants to be a forward.

John Bakers makes up his mind and talks to the coach. He says he will practice hard every day. The coach changes his idea. And he lets John be the forward.

John Baker performs excellently as a forward. He scores many goals in the game. Because of his efforts, his team wins the game.