In this situation, the rhetor is Herb Brooks, The coach of the 1980 Lake Placid USA Ice Hockey team. It’s meant to be a motivational speech to get the players mentally prepared for their game. This speech was given right before team USA had to play against the Soviet Union in the first medal round game. It was given in the locker room to the hockey team as a means of motivation, as the likelihood of them beating the Soviets was slim.

Team USA, in this game especially, is considered the underdogs and not expected to win. The audience, being a bunch of hockey players, gets riled up enough to win the game, and win the gold medal two days later. Without winning that game against the Soviets, the team wouldn’t have moved on to the medal rounds.