From: E!Online

By Cinya Burton and Senta Scarborough

In case you missed it, Britney Spears sent the Internet into a frenzy over the weekend when she posted a sizzling photo wearing only an itty bitty teal bikini.

The singer was on set filming her new video “Work Bitch,” but that’s not the only reason why she’s been toning up.

“She’s been a terror lately, working as hard as she can,” the Grammy winner’s trainer Tony Martinez tells E! News exclusively. “She’s using all sports right now to get ready for her 90 minute Las Vegas show.”

Although her workouts are less than an hour (about 40 minutes), Martinez says they are grueling.

“It is intense, interval training to keep her heart rate up. In a show, she will be dancing and singing non-stop. In her training, she only has about 10 to 15 second rests between each set,” Martinez explains. “She is doing Olympic-style training. This is hard-core stuff. Britney knew she needed to step up her game. She is just drilling it but she likes too! She loves to sweat and she still talks smack to me.”

Because the routines (something he calls Trickeration) are so intense, Martinez’s main focus is making it fun by using sports, which is why he allows her to play tennis and do soccer drills .

 

 

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