I don't exactly to tell you the truth, but most probbaly based around a lot of squats, cleans, jerks, snatches, pulls and other assitance lifts like hypers, overhead presses, push presses, jump squats etc. They are pretty much pulling machines
Rigert is one of the greatest of all time. At 90kg bodyweight he pressed 198kg. Clean and jerked 230kg. I read somewhere that he snatched 200kg in training at 100kg bodyweight. Was an animal. He snatched 170kg without warming up. He stood before the bar for about 10 minutes concentrating. He had beads of perspiration on his body when he finally attempted the lift. Another time he was getting out of the pool at a meet site
and walked in the gym wearing nothing but a nut suit, no shoes or anything and snatched 130kg.