G: Tracy trains Madonna, too—how did that come about?
GP: The first time I did her workout, I knew Madonna would flip for it because it’s so hard and so effective. Right now, if Madonna or I have a project and we’re not in the same city, she’ll work with the one who’s traveling. When I did Iron Man she was with me in California. Now she’s on tour with Madonna, so I have another trainer from her studio here with me.

G: So, what exactly is Tracy’s system?
GP: Tracy started seeing women stagnating from doing traditional Pilates, not having massive changes in their bodies. So she started inventing new moves using the Pilates Reformer, but it wasn’t versatile enough, so she built her own. She did years of research.

G: How does the system work?
GP: First she measures the client and talks about their history and identifies the problem areas. Then she designs a program—a certain number of arm, abdominal, and leg exercises, all done on the machine—and that changes every 10 days. And there’s also dance cardio, [bands, cubes, and bars].

G: Why change the routine so often?
GP: If you don’t, your muscles start to bulk out. Tracy likes to get the accessory muscles working, and they pull everything in. After my first 10 days I lost 11 inches!

G: Have you always been athletic?
GP: When I was about 25, I started doing ashtanga yoga every day. I did Pilates for a while and was always disciplined about it, but I never got the results I get with this.

G: When did you start doing her method?
GP: Two years ago, when Moses was about five months old. It got me to really move my body again. Especially doing the dance aerobics and sweating out all those hormones.

G: Speaking of children, are you planning to go for baby number three?
GP: In theory, I’d love to. But it’s really hard for me when I’m pregnant—I’m sick as a dog for months. Sometimes I think, Oh my God, I want another one right now, I’ll sustain any amount of vomiting or whatever. And then sometimes I think, Gosh, everyone’s sleeping through the night now. If it’s meant to happen, it’ll happen.

G: Is it true you do only one film a year now, to be with your kids?
GP: Yeah, definitely. I haven’t starred in a film since my kids were born, and I don’t think I will. I’ll never get these days back—they’re so delicious, and precious, and hilarious, I don’t want to miss them.

G: What made you finally take the plunge and chop off your hair?
GP: I’d had it long for so long, I think I’d made it like a talisman. I kept thinking about all the life I’d experienced while the hair was growing—I’d look at the ends and think, I had this hair when my dad was alive, and when I was pregnant with my daughter…. Then one day I was doing a Vogue shoot with Orlando Pita and I said, That’s it, I can’t take it anymore. I wanted a fresh start, so he just chopped it off. And now I love it.

G: Did you have to consult with the Lauders?
GP: I texted Aerin [Lauder] and said, “Is it OK if I cut my hair? Do you mind if I do a long bob?” And she replied, “That would look great.”

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