Gwyneth Paltrow uses elastic bands to keep fit.

The 39-year-old actress is a client of fitness guru Tracy Anderson and the exercise expert has lifted the lid on the workout regime that keeps Gwyneth slim.

Tracy says the Iron Man 2 star follows her "Method" regime six times per week, which involves the use of elastic stretch bands, a wooden workout stick, dumbbells and ankle weights to shift the pounds. Tracy insists the reason why Gwyneth - who has an eight-year-old daughter, Apple and six-year-old son Moses with her rocker husband Chris Martin - looks so great is because she is very "disciplined" and is prepared to put in the hours and hard work to look good.

"Gwyneth is uncoordinated during workouts, but she's disciplined," she said.

Tracy has a huge list of celebrity clients she has worked with to get fit including Victoria Beckham, Madonna, Jennifer Lopez and Nicole Richie. She recently worked with pop star Cheryl Cole so she would look her best when she released her third album A Million Lights in June.

Speaking about her work with former X Factor judge Cheryl, Tracy said, "She's petite like me and has a killer body but the trouble with being tiny is weight shows up very easily. Since then, she's been training for 60-90 minutes four to six times a week. She's just like Gwyneth - she works very hard and is a total doll to work with - she's incredibly down to earth."