I agree that it’s a good starting point as well.
I can imagine that for @SaintSovereign and Fire designing a sub like RoB would be quite difficult, as the body is quite a contentious topic in different faiths, and the company strives to be neutral on matters like politics and spirituality/faith, making the subs equally beneficial for any faith.
There are some traditions which emphasize withdrawing from things of the world and “mortifying” the body. There are others which revel in it, glorifying sensuality and taking a more hedonist, “practical” view. And then there are those which acknowledge the body and its purification in order to go beyond the body and master it. Some Hindu/Tantric philosophies have an entire system of rebuilding the body and its muscles through pranayama with minimum food intake required, including the Ayurvedic traditions around kayakalpa (bodily rejuvenation/immortality) and nirahara samyama (a Hindu variation on breatharianism which explores the ability for the body to survive without food, or on minimal food, using various samyamas and prana manipulation techniques).
So there is quite a wide array of possibilities for anyone trying to understand the limitless capacities of the spirit with relation to the body available to look into. Ultimately the sub could not focus on any one specific tradition as this would go against the neutrality, but in the in-between regions and in wording there would be a lot of wiggle room to open peoples minds up to appreciating the depth of the body’s possibilities without steering them in a particular direction. It would just be tricky. I would imagine there would need to at least be some aspect of exploring how the body and spirit could interact. The whole Revelation series is about self exploration, guided by specific subject areas.