Seventh-inning stretch

Yankee Stadium- 7th Inning Stretch
Wikipedia - "In baseball in the United States and Canada, the seventh-inning stretch is a tradition that takes place between the halves of the seventh inning of a game – in the middle of the seventh inning. Fans generally stand up and stretch out their arms and legs and sometimes walk around. It is a popular time to get a late-game snack as well; many vendors end alcohol sales at this point. The stretch also serves as a short break for the players."
Wikipedia
Origin of 7th inning stretch
Baseball Almanac
YouTube: Seventh Inning Stretch, Chase Field, Phoenix, Arizona