Wow I missed this thread picking back up.
I think a lot of people have really hit the nail on the head here.
I have a few things to say about Arnold, his book was made for people doing steroids. Like he used to take. The key to steroids is use not abuse, they are not as bad as they are made out to be except for the people who abuse them. For the every day person Steroids are a BIG no. They are not an instant road to success you need to train hard and KNOW what your doing. He had doctors for this stuff and it was legal then.
There is a lot to working out and every of course is different. I've changed a lot of the things I've thought in the past few months even. Your body is marvelous, it can adapt to almost anything.
One of the big things I can say that will help most of you, don't do the same routine every week, change things up a lot.
It's ok to keep the same muscle groups on the same days for about 3-4 weeks. Thats at least what is working for me. Everyone is different. Try to never do the same workout 2 weeks in a row. There are some core exercises that should always be done, for example Bench/Squats/Deadlifts. There are more then one way to do core exercises too so even those should be changed up as often as possible, for example you can do bench with barbell or dumbells, you can do incline and decines instead of straight horizontal. Cycling is another big thing. Try to not keep a heavy cycle for more then 7 weeks. A Lot of the big guys are saying that you should have 7 week cycles of heavy work, then 7 of light work where you are concentrating on putting on mass. Recovery time is another big thing. always give legs 10 days to heal, so if you do a killer squat/deadlift routine give yourself time. Those are the biggest groups in the body and they will require the longest to heal. Don't do any other exercises on legs or back days.. Your going to over stress your body. Don't try to do legs twice a week either.
Body building is a science. You need to figure out what works for you, some people can do 2 days a week of weight lifting and see modest gains, some can do more and still see those gains.
Don't get over stressed, don't let yourself get sick, don't work out when you are sick.
Stay healthy, stay fit, eat right and enjoy life.