Cameron Diaz is Hollywood's fittest, coolest, most glamorous actress.

Hoping to help other women, Diaz, 41, decided to write The Body Book and delve into the science behind why she looks and feels so amazing, Fox News reports.

"I love the science of the body, and I love to give information and see people utilize it in their own lives. I want women to know that it's never too late to start paying attention to their bodies"

"At the gym, I'll do intervals on the treadmill for 5 minutes, jamming out for 30 seconds at 10 or 12 mph, then resting for 15 seconds. Then I do lunges with rows, squats, and pushing and pulling cables. I use 10- to 15-pound weights if I want to build muscle or 5- to 8-pound weights if I'm maintaining; you have to figure out your own needs and fitness level. I do two sets of 15 reps on everything. The whole thing takes me 20 to 30 minutes."

"I do it first thing in the morning. My gym opens at 5:30 a.m., and if I have an earlier call time, I'll just do a quick run, then two sets of 25 dips, step-ups and push-ups. I think it's important to get a workout in, even if you only have 15 minutes."