Some guys shelve their exercise schedules (and up the take-out meals at their desks) when their jobs get stressful. Not Goreski. The bespectacled, bow-tied style director for stylist Rachel Zoe and star of Bravo's The Rachel Zoe Project started going to the gym regularly when he met the frenetic Zoe. Goreski, who lives in Los Angeles, sees his workout routine as the one constant in his life. "I feel like my body's alive and awake," he says. "You gotta be strong in this industry."

The Basic Routine: He wakes up at 5:45 a.m. and is at the gym by 7, at least four days a week. Twice a week he works out with a trainer, and they focus on complementary muscle groups like the chest and biceps and the back and triceps. "I try to get the most bang for my buck because I usually only have about 45 minutes," he says. "I work out really, really hard, really, really fast." He does Pilates on the other days to tone and lengthen his body. Does he run? "I don't," he says. "My job is a treadmill."
The Philosophy: Going to the gym before work helps Goreski focus for the day. "It lets me get my mind wrapped around what's going to happen," he says. "It also allows me to have a little bit of 'me time,' even though I hate that term."
The Motivator: Men's sample-size clothes—the ones models wear on the runway—are "way too big" for Goreski, but he still needs to stay slim to wear his favorite clothes from Thom Browne, Band of Outsiders, and Philip Lim. "I've bought one too many shrunken suits to toss them out the window," he says.
The Diet: During the week Goreski eats high-protein, low-carbohydrate fare, but on the weekends he orders dessert, such as ice cream or peanut-butter-cup cupcakes. "If I want a cheeseburger and fries, that doesn't mean I have to have a slice of cheesecake after," he says. "You gotta pace yourself."
The Hated Exercise: Goreski loathes squats because they make his legs hurt for days afterward. "I like the glamour muscles," he says. "Arms, chest, and abs."

The designer and Project Runway contestant started exercising because he wanted to bulk up—to the tune of 15 pounds of muscle. He got there by working out with a trainer six days a week, and today he's happy when he steps on the scale. "I'm at the weight I want to be at," he says. "Now it's just about maintaining and adding definition."

The Basic Routine: With his weight goals met, Kashoú's on his own. He goes to the gym before or after work and concentrates on one body part each day. He prefers to do more repetitions with lighter weights instead of struggling with heavier dumbbells, and he gets through it all with the help of the Lady Gaga songs on his iPod.
The Philosophy: Hiring a trainer was the kick-start he needed. "I always wanted to be bigger, but I never had the right tools," he says. His coach was strict, insisting that Kashoú work out regularly and eat only at certain times. "But it felt really good to be on a schedule like that," he says.
The Motivator: "I feel better when I put on jeans and feel like I look good in them," Kashoú says. He also likes when he's focusing on his arms or shoulders at the gym and notices the definition improving before his eyes. "It's nice when you can see your muscles," he says.
The Diet: Kashoú eats about every three hours. During the day he allows himself a variety of proteins, vegetables, and carbs, but at night he limits himself to protein. "The challenge is eating so often," he says. "That's where the hard work really goes in."
The Hated Exercise: Working on his legs. Kashoú dislikes it so much that he splits his leg exercises into two days; one day he'll do the front and the other the back. "Legs just take the life out of me," he says. But he doesn't want to forget them—or any other part of his body. "I don't want to be lopsided," he says.

Reporting contributed by Jacob Hentoff and Sarah Isaacson