4) I personally believe that this type of training (bulgarian) works for all lifters. Although whoever has the most desire will be the one with all the success.
Training lifts will eventually start to go backwards as you enter into the "dark times". When you are so sore and fatigued that you cant even imagine lifting weights. This time is CRUCIAL to training. You MUST persevere and continue to train! Eventually your lifts will begin to improve and you will make progress and PR's while in a totally fatigued state. When you can make progress when feeling like this, this is when you are going somewhere.
2) percentages don't work. I go down 20-30 and if its too easy, then we go back up. there are times that the reps end up being more than what was the original max that day. The body is amazing when you push it. You never know what you are capable of doing on any given day. The way you feel is a lie.3)this is a tough one to swallow for most... THERE IS NO SUCH THING AS OVERTRAINING!!! if you can't do something you are not in good enough shape. Here is a story:IF you got a job as a garbage man (or run a jackhammer, or some other physically demanding job) and had to pick up heavy cans all day long, I'm sure the first day would be very difficult - possibly almost impossible for some to complete so what do you do? take 3 days off and possibly lose your job? NO! you would take your sore, beaten self to work the next day. You would mope around and be fatigued - much less energetic than the previous day, but you would make yourself get through it. Get home, soak in the tub, take aspirin, etc. The next day would be worse..etc. etc. Eventually you will be running down the street tossing cans around and joking with your coworkers. How did this happen? You forced your body to adapt to the job at hand! IF you cant' squat everyday, lift heavy everyday then you are not OVERTRAINED, you are UNDERTRAINED!