Britney Spears has taken Entertainment Tonight behind-the-scenes at her stage set up and rehearsals for the upcoming Femme Fatale tour. 

The high octane kinds of performances that the 'Till The World Ends' singer is known for will return with this extensive string of dates, and she explained to Mark Steines that conditioning her body is not only a priority, but essential:

"Before I come to rehearsals I've been working out and stuff so I won't have that predicament. I eat really clean right now."

"I have an instructor that's going to be on the road with me and he actually does a lot of my meals and stuff like that for me too."

Talking about how she keeps her fantastic shapely "dance legs", Spears added:

"I run a lot!"

Spears' tickets for the UK leg of her Femme Fatale tour went on general sale this morning, June 10, and you can watch the full interview below: