I actually dedicated 30 days to CF to see what all the buzz was about. I like a lot of the exercises, but I personally do not like the idea/theory of it.
I like the explosion aspects, and many of the compound joint exercises that CF utilyzes, but I think it lacks provisions for particular muscle groups.
I train 4-5 days a week, and usually write my own routines, using periodization, and changing everything every 6-8 weeks.
I started out at 208 with ~9-9.5% body fat, after a solid 30 days of CF, I was 190 and ~8% bf. What I did not like about it was the lack of emphasis on chest and arms. My back, shoulders, and legs all seemed to handle the weight loss well, but my arms and chest lost a lot of size!! My cardio was not any better, b/c I do cardio all the time.
What did occur tho, was I hurt my achilles from all the box jumps, and explosive exercises, and had to cut way back on the cardio. That was toward the end of the 30 days tho, so I did not lose out really on that aspect.
I am now back to my normal thing, and working on rebuilding the lost mass in my chest and arms, all while maintaining the rest of my body.
I did max squat during my CF experiment too, and got 470 as a 1RM, so that was good!!
Overall, I think it's ok if you want to get "fit", build functional strength, and create muscular and cardio endurance!!
I'm 32, married and have 3 kids now, and wonder why in the hell I do any of anymore tho??:lol: