10 sets of 10 reps per bodypart. 6 days a week, 2 parts, 2 hours a day. Nothing else will work.

If you're on steroids.

Not really, you just have to have "it"--some do and some don't.

Not near enough recovery for 99.9% of population.

Also, most people, and I prefer it, do chest and triceps together in one day, and bicep and back on another day.

When I go hard here's my week.
Monday and Thursday quad based legs-abs on Monday. Thursday was hamstring and glutes based legs and abs.
Tuesday/Friday. Back and biceps
Wednesday/Saturday. Chest and triceps

This allows for rest and rotation.
For gaining strength, do 4x4-6. And those 4 reps need to be failure reps.

Question: How can you get to failure without breaking form or lifting incorrectly?

I struggle with this balance. That forced failure rep for me means failed form and usually the rep before.

Failure is a tricky question, when lifting by yourself. When I was young, failure meant dumping the weights. Now that I am older, I know when my form breaks and I end it there or go one more possibly. Safety is paramount. At my age (49), I consider breaking form the end.

My 18 year old son, always wants to beat me by as much as possible. He will go till I yank the weights. Older you get, the more caution you must exercise.

At damn near a half century, I can still hold my own, but the days of bending the bar on bench, are long since over.

Do what you are comfortable with and do one more!

With squat it's fairly easy, you use a safety and when you can't get that last rep, you can drop to the safety. But usually you know if you can do another or not. If it's dumbbell press, you push up until you can't, still should have good form on that. That's why preacher curls are popular, can't cheat. Or curl with your back on the wall. Incline curl and prone incline curl are good ways to keep form and use heavy weight too.
Bench press is the only one I don't recommend to failure, unless you have a spotter. As everyone has said, form, then weight. Arnold says it multiple times in his book as well. And his book also has his old workout routine in it.

For bench strength gains I'd go:

10 totals sets

8 sets of 3 reps with heaviest you can handle (should recover to complete the 8 sets with same weight)

1 set 2 reps

1 set max


Always have a spotter or bench with no clamps

That's heavy man!