What training method would you propose?
What I propose, is training smartly. What I do myself is quite simple routine, three days per week, starting Monday, training every other day:
1. Chest + arms
2. Legs
3. Back and shoulders
Lot of crunches and hyperextensions, stiff legged deadlifts etc. for abs and lower back as a warm up every day.
This way I can go heavy all the time, meaning that every set is done to the failure. Basic exercises, but all the time with best possible form and range of motion. I use supersets, giant sets etc. for changing the routines, and it works quite good. What is important about this split is obvious: You doesn't stress the muscle which you have just trained at the next training session. Only legs are sore at the Friday, but that doesn't matter, they are sore till Sunday anyway. I am 56 but this way of training gives me a better growth I have when I was 30, training with the four split and not minding too much about the form and the range of motion..
As you see, there is no big secrets, just simple basics, and that is the vital point. By my experience of 25+ years, people are overcomplicating their training, while cutting down back to basics would give them better results. I see this happen all the time, natural builders try to keep up with the pace of the gear using pros, and that is utterly stupid thing to do. You get best results when you give your body some time to relax between training, time to recovery, and then you can max out in every exercise you do at the gym.