These Training Grounds aren't like the others, it's a giant room below the surface that takes up the underground of the entire Twelfth Division sector. In this very room you can change the landscape and it's all really. The walls are indestructible so don't be afraid to get a little destructive. Also if you want to change the landscape again just go back to the little computer by the entrance and describe in full detail what kind of battlegrounds you want. You can even generate enemies such as hollow and arrancar to fight too. You don't have to worry about dieing or getting seriously injured here, it's self automated to stop itself the moment it reads your body damage levels as too high. You can also change when you want it to stop by time, number of enemies killed, or by said damage levels. Don't be afraid to get creative to suit yourself getting comfortable, even if it's someone from the Seireitei your angry at you can "get back at them" here, just don't tell them...