What is Crossfit?
CrossFit is a fitness program that uses constantly varied (always changing) functional movements (essential to everyday life or sport) applied at high intensity (relative to your fitness level). It is designed to increase your capacity (ability to do work) over many different time (from short to long duration) and modal (any physical task) domains.
CrossFit develops a broad and general fitness that prepares you for the unknown and unknowable because in life and sport, you rarely know what you are going to come up against.