I bet most if not all professional athletes use periodization. At some point, the stimulus required to produce adaptations will overwhelm your recovery ability, and you need to start adding lower-intensity work.
This isn't actually a Crossfit move per se, it's a strongman move called a "Continental Clean" or "Axle Clean/Jerk". The form still isn't great, but I just wanted to point out this isn't a power clean and jerk.
Edit: I missed that someone else posted this below, but thought it deserved it's own easily seen distinction.
I use the "7-minute workout" android app. There's a bug in it where you can't switch apps in the middle, but I consider this bug to be a feature! For whatever reason, the chromium plugin which was my backup, no longer works (I also liked it because it plays a nice arpeggio at the end, so that's a positively reinforcing primary stimulus).
If you're asking about the workout, I've begun modifying it - I now do the 7 minute workout with 5 lb dumbbells and 5lb ankle weights. I also often do some pull-ups before and after. I also do triangle push ups (or sometimes clap-push ups) instead of the push ups, I do side-to-side push ups (http://www.youtube.com/watch?v=dqQcQrXoYrw) instead of push-up and rotate, and instead of side planks, I do static leg lift, at about 5 degrees elevation.
when I first started out I was doing 7 days a week, but cheating (which is fine, you do whatever to bootstrap) - now I'm doing 5 or 6 days a week, which I think is sufficient.
This next part is speculation, but if you were servicing many of these requests, wouldn't you just create an API to help you out? You aren't getting paid (much? Note: "Cost Reimbursement" section in above link) to help them out.