Any Good Gyms/CrossFit in the Area? (Nairobi)

Looking for a well-equipped gymnasium, the closer to the Westlands the better. Specifically, I'd like one that offers high-intensity classes of some kind, and that puts an onus on correct movements.

In my absolutely perfect world, there would be a CrossFit class or even a CrossFit-only gym somewhere in the city (for those who have heard of this lung-scorching program), but so far I have been unable to locate one, which is odd because I think you can get certified as a CrossFit trainer in Nairobi...but maybe I'm missing something.

Any suggestions would be well appreciated!