Are you sure that is Crossfit? From the basic fitness article they offer at their website for free, they talk about how for total fitness, an athlete should learn the basics of gymnastics (pushups, dips, pullups, rope climb), then muscle-up, for abdominal work, the L-sit and situps, and handstands, walking on the hands, and handstand pushups.
They also recommend exercises on the gymnastic rings if you have access to them.
In addition to gymnastics, they recommend learning the Olympic lifts (snatch and clean and jerk) and powerlifting (benchpress, barbell squat, and deadlift). These exercises build real strength and power.
They also emphasize that learning the Olympic lifts in particular takes time because of the techniques and strength required. For example, a good clean and jerk requires first a good barbell squat, a good deadlift, a good jerk, then you learn the clean, then you combine the clean with the jerk.
They talk about flexibility as well and stretching.
They say to "regularly learn and play new sports," as sport is the application of fitness. Playing sports develops all the physical qualities at the same time, but only in small amounts. Whereas training will develop specific qualities, but with repetition.