I am still not sure about the concept of Emperor Fitness.
We have Spartan which does exactly what @Lion said about the Alpha Body:
“Spartan will work on every single facet of your body that is malleable to change with you specifically. It will mold to you and your desires, as well as what would be the most effective outcome for you and your needs.” (Salespage of Spartan - Apex Warrior)
There is scripting for health “improving your basic physical attributes. Your organs, your bones, your skin, your health in general.”, or for specific sports “Your profession and hobby do not matter, Spartan will work alongside you.” & “Bodybuilders, boxers, soldiers, gymnasts and any other.”
So Spartan already works on all our wishes that we mentioned here and in other threads. So why is Fire working on a multistage sub called Emperor Fitness? Of course a multistage always makes it cooler for the user as he is able to fine-tune his desired outcomes but I do not see any real need for that. He could just update Spartan to the new technology Quantumtech.
So there must be something new that made Fire so excited that he is working on a multistage or which only works because it is a multistage