CrossFit is a broad, general and inclusive fitness program. It utilizes a constantly varied workout consisting of functional movements (think squat) that are performed at a high level of intensity. There are hundreds of "affiliates" across the country and the best way to learn more about the flavor of CrossFit happening at Littlefield's Gym is to come try a free Introduction to CrossFit class. Also the main CrossFit site offers a wealth of information and instructional videos about the movements and why the program is so effective.
