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Celebs including Jessica Alba and Cameron Diaz love it, and if you're a runner, you may love CrossFit too. This workout is all about basic exercises involving body resistance, gymnastics, aerobics, weight lifting, and other high-intensity moves. Read on to learn why you might want to skip today's run and head to the nearest CrossFit box.

The Problem with Running
"Runners think that their legs are strong, and they are strong at that one movement pattern. But life is more than just that one movement pattern," says Reebok ambassador and level I CrossFit trainer Yumi Lee, who trains Alba.

Since running is a linear, repetitive movement that involves mostly your legs, it can cause an imbalance in the rest of the body, which can lead to injury now or down the road. Solely running also leads to workout plateaus, so when the muscles become used to the demands placed on it, a runner needs to run farther or faster in order to maintain her level of fitness.

RELATED: The Indoor Running Workout

Why CrossFit Is a Good Complement to Running
CrossFit exercises involve your whole body rather than isolated muscle groups, which strengthens from head to toes and makes you a better runner, [Tweet this tip!] says marathoner and CrossFit instructor Shirley Brown of CrossFit L.A. CrossFit combines power lifting, strength training, and gymnastic training, all of which benefit the fast-twitch muscles used for sprinting and slow-twitch muscles used for long distance, Lee adds. Working your entire body will also help you lose overall body fat, which may increase endurance and speed and also help you maintain proper form during runs and therefore avoid injury.

Another benefit? CrossFit helps prevent those dreaded workout plateaus so you'll actually be excited to work out. "CrossFit forces you to do things you would have never done before and to push yourself in a way that you thought you had pushed yourself," Lee says.

Tips for Getting Started
Find a reputable facility and sign up for the on-ramp (sometimes called foundations or fundamentals) program so you can master the basic exercises. "It's a comfortable and safe way to learn the movement patterns so you can stay injury-free," Lee says. You'll also learn beginner versions of certain moves; for example, if you've never done a pull-up, they'll show you how you can do one using a box and a band. Then you can jump right into regular classes, modifying exercises as you need to. Some gyms offer endurance programs or private instruction, so if you have a specific running goal, they can help you achieve it.

Don't just jump into a new CrossFit program, however. Meghan and Tyler Barnes, owners of CrossFit TT, warn that you'll be super sore when you start, so it's probably not a great idea to sign up when you're training for a race. Definitely listen to your body, but stick with it—don't miss a class on account of being too sore. Good programs will go easy on the muscle groups that were worked hard the day before, and getting your heart rate up can ease soreness.

How to Prevent Injury
Pull-ups, handstand pushups, and pistols (one-legged squats) are pretty intense exercises, so if you want to avoid a CrossFit injury, pay attention to your fundamentals and make sure you're using the proper form, Lee advises. Don't do an exercise unless you understand the movements, and when you're ready to make an exercise harder, only change one aspect at a time such as speed, weight amount, or number of reps. Some 60-minute classes include warmup and stretching afterward, so if yours doesn't, be sure to take some time before and after to fit them in. [Tweet this tip!]

RELATED: What to Expect at Your First CrossFit Workout

How Often Should Runners Do CrossFit?
All four CrossFit instructors agree that it all depends on your goals. If running is your focus, use CrossFit as a supplement and do it as often as it fits into your workout schedule, about two to three times a week. You can increase sessions in your off-season when you're not training for a race. "Don't overdo it," Meghan Barnes says. "Taxing your muscles without rest days is a surefire way to injure yourself."

Should Runners Eat Strictly Paleo?
To increase performance and build muscle, many CrossFitters follow a paleo diet, which excludes grains, dairy products, legumes, refined sugars, and any other processed foods. We're talking consuming mostly meats, fruits, vegetables, nuts, and seeds. While eating close to nature and ditching artificial or overly processed foods is healthy, a runner doing long workouts needs carbs for energy. Lee recommends eating 80 percent paleo but to modify based on your workout needs.

Can't make it to a CrossFit gym? Check out these home CrossFit workouts, including a 10-minute CrossFit workout with Yumi Lee and a 10-minute full-body circuit with Shirley Brown.

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