Originally Posted by Off Road
The part you aren't understanding is:
These guys didn't start with this volume of training
They started when they were very, very young
They built their volume and complexity over many years
You can do the exact same thing, as long as you don't try to do it all at the beginning, you'll just burn out and regress. That's why so many full-body routines start out so basic and get more complex as you get stronger and build work capacity.
Ahh ok see now, thank you.