What Is Crossfit?
Glad you asked. To put it as simply as possible, Crossfit is an exercise program that focuses on overall fitness, rather than focusing on any particular aspect of it.
Consider 2 athletes who are the best in their field: a marathon runner, and a power lifter. The marathon runner has the endurance to easily outrun the power lifter, and the power lifter has the strength (& power) to easily out-lift the marathon runner.
Who is more fit? Tough call. Each could argue that he/she is more fit than the other. But probably neither would do very well at a Crossfit competition where the full spectrum of physical abilities are necessary to perform well (not only strength or endurance, but also speed, flexibility, coordination, balance, etc).