The Ballroom is accessed via the Main Hall.
Lara has turned the Ballroom into a gym. There the player can practice many of Lara's movements with instructions given by Lara.
"This used to be the Ballroom, but I've converted it to my own personal gym. What do you think? Well, let's do some excercises," Lara says as the player enters the Ballroom.
Right next to the Ballroom there's the Swimming Pool. Also, via the Ballroom the player can find a golden treasure chest at the second entrace to the room, which is blocked by crates.