Leo, Ben, Russell… one minute they're bulging in all the wrong places, the next they're sporting a body to die for. So how do they do that? Read on…
Ben Affleck
We all know that Ben, a bit 'soft' in his breakthrough role in Chasing Amy, has pumped up since then. But it was his role in Going All the Way that got the actor in what he claims was the best shape of his life and prepared him for the likes of the blockbusters Pearl Harbor and Sum of All Fears. So how did he do it? Running twice a day and lifting weights six times a week, according to reports.
Even Sandra claims to have 'fat days' (hard to believe), but running and light weightlifting keep Miss Congeniality in pageant form. It's good to know, however, that she still hankers after that American treat, raw cookie dough. There's still hope for us all.
Russell Crowe
The wonder from Down Under seems to travel in fitness style these days. If reports are to be believed, the on-again, off-again abs of steel are sculpted in a 48-foot, 18-wheeler gym, stocked with nearly $50,000 of exercise equipment, including weight machines, a treadmill, an exercise bike, a rowing machine and, most recently, a punching bag.
Janet Jackson
A fan of fried catfish and sweet potato pie, this pop diva forgoes her favourites - including anything with butter, cream, cheese or egg yolks - for steamed veggies, baked chicken and salads when she's getting in shape for a tour. Her workout secrets include exercising six times a week (a lot of dance, it's safe to assume) and meditating in both the mornings and evenings.
Ricki Lake
The talk show talent credits going vegetarian with her astonishing 125-pound weight loss. Currently a fan of The Zone, a moderate-carb, protein-rich diet, Lake says that cutting out alcohol, salad dressing and bread, combined with exercising - swimming, biking, running and sit-ups - help her stay healthy and happy.
Madonna
Acres of newsprint have been written about Madonna's fitness regime. The material mom, now having shed weight from two pregnancies, tries to squeeze in an hour of tough Ashtanga yoga every morning for both her mind and body. Though she often likes to go for shock value in her videos, Madonna's palate is on the plain side. According to MTV, her favourite snack is toast.
About to film her first role in a long while - as a fallen Angel in Charlie's Angels 2 - Demi's fitness routine was crucial to sculpt her body into shape for tough roles such as G.I. Jane. When she travelled to movie sets, she was never alone. In tow were no less than her personal trainer, a yoga instructor, a chef and an exercise trailer.
Shedding a whopping 50 pounds for his role as middleweight boxing contender Rubin Carter in The Hurricane, Denzel became addicted to the sport. He trained for no less than one year to get in match shape for the movie and claims that boxing will be part of him for the rest of his life.
Oprah Winfrey
Who hasn't heard every cough and spit of Oprah's momentous battle with her up-and-down weight? In her fitness heyday, the queen of daytime television and self-confessed carbo-addict often rose at 5.30am to get in the first of her two daily workouts. And, even though she claims to despise exercise, she can often be spotted running along Chicago's famous Lake Shore Drive or on country roads near her farmhouse in Indiana.