When I was into body building but constrained by being an obvious "hard gainer" I tried lots of training and nutrition ideas, the one diet that seemed to pay off was what one guy described to me as the "all red meat" diet. No you don't only eat red meat, but you try to consciously consume as much as you can. Steak for breakfast with eggs, hamburger for lunch, even eat a big steak right before you go to bed as as long as it's not too many calories for your body to use soon it won't convert to fat.
You also have to break out if the mold of thinking whatever the big guy in the gym does will help me. Find a guy who looked like you a few months ago and is now noticeably bigger.
In those days I trained at Gold's Gym in San Diego right next to Achim Albricht, Sonny Schmidt, Big Jim Quinn and Milos Sarcev. It was quite obvious these guys were both genetic freaks and on steroids, I remember one of the more candid trainers speaking about them and Dorian Yates in particular, saying Dorian could push a broom all day and not look much different than he did then.
What they were doing and eating had little relevance toward most of the rest of us. The biggest scam was Weider magazine's constant use of endorsements by pros for advertisers selling protein powder and the like, one month Milos appeared in an ad proudly showing him holding this outrageously expensive, horrible tasting powdered cardboard and dirt mixture (tastes that way at least) and he laughed at the fat check he was paid and word around the gym was he had used it just once after they comped him some as part of the contract and he spit it out after tasting it.
The ad made it sound like all his muscle came from using that product.
I did find the Arnold Schwarzeneggar encyclopedia of bodybuilding to be a reliable and helpful reference. Weider's rags are best used for puppy training, fully useless and most of the "expert" famous columnists are egotistical dopes arguing their way is best, silly for the above explained reasons.
(I was once confident I would be into bodybuilding until death. That ended one day when I was doing incline press on a smith rack, felt strong that day, threw an extra ten on each side going for six. On the third rep I turned my head left to look at the mirror and check my form and heard a pop, lucky the smith rack caught the bar for me. I don't know what I injured but it was moderately painful, and I could never pick up a 45 plate without almost dropping it from the pain. Kept trying to go back and train for two years but it persisted. Today 15 years later I have severe scoliosis, possibly related?)
In conclusion, one can fairly say that the lean BMI or body weight of modern professional top bodybuilders is about 40% higher solely as the result of massive use of very potent hormonal drugs such as androgenic-anabolic steroids, human growth hormone, IGFs, and insulin. This is more or less consistent with the observation of nowadays natural bodybuilding contests, where the BMI-values of the champions are rather close to 25 than 30. It is therefore fair to say that today's top heavy weight bodybuilders have more than half of their lean muscle mass thanks to the drugs, rather than hard training and good nutrition. No, the steep increase of lean muscle mass among top bodybuilders since the 90's has nothing to do with better genes, better training, better nutrition or supplements. Unfortunately Ronnie Coleman does not come from another planet, as many of his fans would like to believe.
Forced reps are basically reps in which you force up the weight during the up-phase because it is too heavy to lift it in the normal way, often helped by a spotter, followed by slowly lowering the weight in a controlled fashion to the bottom, without the help of a spotter. Many spotters, however, let the forced up-phase take much too long. The up-phase of a forced rep should basically take the same amount of time as the up-phase of a quality rep. Forced reps can be very effective as lots of the growth stimulation actually comes from the down-phase (negative part) of the rep, which is very stressful for the muscle fibers.