Pull-ups

The Crossfit philosophy advocates kipping pull-ups, which are different than standard, dead-hang pull-ups. In a kipping pull-up, you swing your body and drive your hips upward, using your entire body to raise your chin over the bar. This can be difficult to learn, but the idea is that you can do more pull-ups in less time and thus work your muscles more intensely than you can with dead-hang pull-ups.