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We see the bulk of human action as being composed of a limited number of irreducible fundamental movements. These fundamental movements we call functional. They include, but are not limited to, squatting, deadlifting, cleaning, lunging/running/walking, jumping, throwing, climbing, and pressing.

This reductionist view has us asking of every exercise ‘How universal is the motor recruitment pattern?’ When this litmus is applied to biking and the bench press, the answer comes back ‘not very.’ When we ask the same of running and push-press, the answer comes back ‘very.’ — Greg Glassman, http://www.crossfit.com/journal/library/12_03_Wallball.pdf