This is the routine and these are my questions: 1) When it says 3 x 8-12, what does the "8-12" mean? That I should start with 12 repetitions, then 10 with more weight, and finish the series with 8 repetitions? 2) Why the drastic change in the number of repetitions between exercises? For instance, squats are only 3 x 6-8, but leg extensions are 3 x 10-20. Wouldn't it be better to keep the same amount of repetitions for all the exercises (for instance, all at 6-8)? 3) The upper body days are very weak, since this routine is focused on legs; hence I'd like to change the excercices and repetitions for chest, back, bis/tris and shoulders: would it be ok to keep all my excercises for upper body at 3 x 6-8 to failure? Thank you!