I remember when I was a competitive swimmer (over 20 years ago), our strength coaches had us perform a number of exercises as fast as we could do them. There were anywhere from 5 to 20 different exercises (Olymbic lifts were some of the moves) and with some running involved as well. Other times, we were combining swimming with other land exercises (such as pushups, sit-ups, burpees, pull-ups, rowing, etc.). It was great for us because it helped us with our overall conditioning, but we were competitive athletes and not novice athletes. The idea of Crossfit is not new, it just happened for someone like Greg Glassman to come along and trademark the name and make millions of $$. I agree with all of the anwsers that are posted in this topic. It can be a great workout if it is done correctly. I know many people who went to Crossfit classes and were injured. I believe it’s more of a competition contest than just simple fitness.