CrossFit is a strength and conditioning method where exercisers perform functional movements (squats, kettlebell swings, and running, to name just a few) at high intensity.

Most workouts are timed, with the goal being to complete a required number of reps as quickly as possible. Created by former gymnast Greg Glassman in his Santa Monica gym, CrossFit has grown rapidly over the past decade, from a handful of “boxes” (CrossFit-affiliated gyms) in 2005 to nearly 8,000 worldwide as of mid-2013. CrossFit combines elements of gymnastics, weightlifting, powerlifting, endurance training, and calisthenics to promote general fitness, but it is also used in some sport-specific training.

Learn More:

Greatist’s Resources on CrossFit
A Look Inside the World of CrossFit

External Resources:

Greatist's Fitness Editor explains how CrossFit contributed to multiple injuries, poor self-esteem, and even reconstructive surgery — and why he still does it.
The 2013 Reebok CrossFit Games are like the Olympics of working out — and they’re starting TODAY. Find out how (and why) to watch the excitement here.
What if you could fix injuries before they happen? Physical therapist and mobility champion Kelly Starrett is out to show the world how we can build stronger, faster, and safer bodies.
CrossFit is still developing as a sport, but it's already attracted its fair share of elite athletes. We sat down with Ian Berger, a 22 year-old competitor and recent college grad who's redefining what it means to be a top CrossFitter.
A new app from GAIN Fitness promises to streamline CrossFit fitness tracking. We investigate WOD Unboxed to see if it lives up to the hype.
A new version of Under Armour's online competition is motivating thousands of women to become their fittest, healthiest selves.


GUEST POST: Trainer Jess Allen talks about using CrossFit to improve her running performance, and how readers can apply the same lessons to their training.

CrossFitter Christy Phillips is one of the fittest women on the planet, but a few years ago even she struggled with pull-ups. We talked with Christy about what it takes to become one of the world's best.

For some, exercising is about more than just looking good. We caught up with Rudy Nielsen, one of the world's most successful CrossFit coaches, to talk about training to become the fittest in the world.

Rolando's workout with Flo Haselhoff, founder and coach of Crossfit Berlin, in Germany.

The CrossFit Games season is in full swing. And with nearly 140,000 participants in this year's CrossFit Open, only the best will move on. One such athlete is Matt Hathcock, a veteran competitor working for his first-ever trip to the sport's biggest stage.

Every weekend the Greatist team gets together to put a new workout to the test. This week's? CrossFit!