Does Crossfit really work?

Almost 2 months of training, have I become a little bit more Fit? Let's see it:

BEFORE 

I've calculated my fat mass of September and it was 33 kg.

AFTER

I believe that the part of my body that has got better has been my legs. During our first training I can't almost walk, but this has changed. For example, yesterday it was our last crossfit training and I worked mainly on my legs (squats with heavy ball, frozen squats and squats with the TRX) and today I am like I didn't do anything, I haven't got any stifness. In adition, working on my legs has helped me in order to improve my shots with the left leg: since I broke my ligament I wasn't so sure when I shooted with that part, now I've changed that.

My arms have improved too but not as much as the legs, I'm still having stifness.

It seems like Crossfit really works!!! I feel very proud of myself :)

DREAM IT, WISH IT, DO IT