Hi Serge, welcome to Getbig. It's afternoon for us europeans

I've got a couple of questions:
1. I noticed you recommend 12 reps for most exercises. Did you personally ever go lower than 12 reps per set? In recent years there's been a trend of fewer sets and 4-6 reps up to 8 reps maximum, yet people like Ronnie Coleman rarely go below 12 reps per set and Lee Haney for the most part recommend at least 10 reps.
2. Some people claim they overtrain when doing too many sets, but I think this has more to do with them going to failure too often, not the number of sets. What's your opinion on going to failure? (with failure I mean reaching the point when you simply cannot, by your own, complete another rep no matter what)
Thanks.
Bluto