When you are in peak form, you actually feel the effects of nutrients in your body very intensely.
I started with 1 hour of extremely intense cardio. The first 40 minutes you can go through before the sugars from the oatmeal start to hit, but starting around that 40 minute mark, the real burning of your body stored energy starts to kick in and you can realy feel those flows. The next 30-60 minutes I did high rep but relatively low intensity strenght training. This is what the oatmeal was for.
The idea of the high caffeine shots right after training just before the sauna was a hack to make you want the training more. You mentaly fuse the caffeine addiction reward into the workout routine so your brain craves the workout.