Here's how 9 celebrities work out, and what the science says about their fitness plans

When it comes to working out, everyone has their favorite method - including celebrities.

But not all types of exercise carry the same benefit. Which one you do depends on your goals: Do you want to bulk up? Slim down? Or just get fit and healthy?

Given all the different advice out there, it's important to know what the research supports.

Here are the workout regimens of some of our favorite celebrities, which we've evaluated according to science.