Margot Robbie's crazy three hour workout routine

She's got the insane bod we all dream about, but Margot Robbie's lean look doesn't come cheap with the actress's trainer revealing she worked out three hours a day to prepare for her latest flick Suicide Squad.

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Andie Hecker was on hand to make sure Margot was in tip-top shape to play super villain Harley Quinn, who spends most of the movie in short shorts.

"She was a total trooper. It was very satisfying to see her body change into exactly what she wanted it to look like in such a short time," Andie told People magazine. "There's a scene in Suicide Squad where she changes clothes in front of a bunch of dudes, so her abs needed to be impeccable. And in those tiny shorts Harley wears, her butt was constantly on display."

"We did a lot of heavy-weighted, low reps of arabesque pulls hooked up to resistance pulleys, as well as arabesque lifts with heavy ankle weights in order to build and lift the butt. We also did a ton of side series outer thigh work, targeting outer glutes with high reps and low weights, to pull those muscles in and create a beautiful line from the waist to the upper thigh."

Mixing in cardio such as skipping and ballet jumps, Margot also practiced Pilates and swam laps to look her absolute best.

And when it came to food, Andie reveals Margot wasn't a fan of calorie counting, instead making sure she had enough fuel to get her through her intense workouts.

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