"The [Vegas] performances won't be simple—they'll be a massive party from start to finish," Spears says in the May 20 issue. "And to pull this off, I have to be in top condition and running at full speed."
The former X Factor judge will be performing at the Planet Hollywood casino and resort on Las Vegas Blvd. every other weekend, beginning this fall, for a two-year run.
"I'm doing 90 minutes of yoga twice a week in addition to a lot of cardio—hour-long sessions three times a week with my trainer, Tony Martinez," Spears told the magazine.
Will you see Britney Spears in Vegas?