Requires a bit more equipment, though:

"An Olympic weight set and a place to do pull-ups and dips is essential to doing CrossFit. Gymnastics rings and parallettes, plyometrics boxes, a Dynamax medicine ball, dumbbells, kettlebells, climbing rope, Concept II Rower, and a glute-ham developer will equip your garage with more than enough to follow the WOD very closely."

Do what you can with what you got. The training philosophy is more what I had in mind.