Madonna is pushing 50, yet she's one of the most buffed-up celebrities you're likely to see. She follows a rigorous 6-day-a-week exercise regime to stay in shape for those energetic live shows.
During her life in the English countryside, Madonna could do more exercise outside than she could ever have done in New York City.
She said recently, "I mix it up - Pilates, yoga. I do it six days a week. Actually, Sunday is horse riding. There is no such thing as a day off."
But Madonna's real secret is her Power Plate machine (pictured, right). This oscillating 'miracle machine' claims to offer the benefits of an hour-long workout in just 15 minutes!
The only problem? It'll set you back $15000. However, Power Plates are starting to be seen in some gyms now.
Losing that post-natal baby weight is one of the hardest things you'll ever do, but Denise Richards lost 30 pounds in 4 months after having her second child. Denise got up at 5am every morning and went to the gym with her personal trainer to lift weights and do cardio.
Denise proves it - there's nothing unusual about the diets or exercise regimes of most of these celebs, they just have incredible motivation to pull it off.
Everyone's favorite girl-next-door, Reese is another one of those celebrity moms who get back in shape so fast.
Reese stayed away from the hard workouts, enrolling instead in Kundalini Yoga classes with Gurmukh, an internationally renowned Yoga teacher.
It only took Reese 8 weeks to get back into movie star shape. She also makes sure to eat healthy and gets plenty of outdoor exercise and walking when she can.
When Uma lost her baby weight, she was lucky enough to have an exercise plan ready made for her. The 'Kill Bill' star actually used the sword-fighting and martial arts training that she picked up in her movie with Quentin Tarantino.
Thanks to this high energy, aggressive workout, Uma was able to lose 25lbs in just 6 weeks. For the rest of us, sword-fighting is not usually an option offered by our local gym! Kick boxing classes are a good substitute though.
Britney put on weight during her pregnancy, but soon after the birth, Britney cut out all the Southern fried food that she was brought up on and instead ate meals full of vegetables and low calorie leafy greens.
The best exercise tip that Britney can give us though, is dancing. Britney's body transforms every time she goes on tour, as her energetic dance routines bounce her back into shape.
I'm sure most of you noticed Fergie's body transformation. She achieved it with hard work and dedication.
Four times a week she spends an hour on a varied exercise routine that includes running 2-3 miles, lifting light weights and doing lunges and crunches.
Evangeline keeps her daily exercise routine interesting by mixing it up with running, yoga, Pilates, dance, weights, scuba diving, and surfing.
Her 2 top health tips? Get 8 hours of sleep and drink plenty of water.
If you have recently seen the movie "The Wrestler" than you have been able to see how good 44 year old Marisa Tomei's body looks. She's in great shape for a 25 year old, never mind a woman of her age.
She credits her physique to Hula Hoop dancing. It whittles down that waistline by strengthening the torso muscles, and its also intensive enough to really get your heartrate up.
You can buy exercise videos online from Hoopgirl. You can use the Hula Hoop around your waist, hips, and arms, or even lie on the floor to work out your legs.
Have you wondered how Jessica Alba magically bounced back from having a baby so fast?
"I play all of the Wii fit Sports games, like bowling, tennis and baseball. That's a lot of fun", says the beautiful actress with one of the most enviable bodies in the world.
If there is any chance I can look that perfectly svelte I'll buy one right now!
This upbeat singer has energy to spare, but needs to focus on her workout routine when she's travelling for concerts and media appearances. She takes a skipping rope with her everywhere - its very economical and portable for traveling.
"I hate working out, but I love jumping rope," says the star. "There's a rhythm. It's like dancing. I can double jump; I can cross. I can do all of it. I look like Rocky when I jump rope."