Exercise is very important, even in the Wizarding World.  As you run, you come across a building.  This place is Hogwarts School of Witchcraft and Wizardry.  You step inside, and are whisked up too a place you've read about for years.  The portrait swings open, and you are ushered into the Gryffindor Common Room.  After your run, this is exactly where you want to be.  The gang's all here, even Harry Potter himself.  Come on in, there's something to do for everyone.