This is a wonderful topic and I'm going to have to come back and study more on this.
Our body is our temple, and I believe the secret to greatly extended lifespan is a deeper affinity with and understanding of our body and its various demands.
I also like pointing out the fact that, while we think ourselves as a single entity, we actually manifest as a collective of billions of entities working together simultaneously: our cells! And systems, organs, and even several pounds of beneficial bacteria that live in our intestines and help digest our food!
The medieval alchemists had meditations for going into the body and building a mental representation of its various parts as a castle, with different rooms of the castle representing different body parts, and so giving us a way to mentally interface with our body. I'm inspired by this idea but would rather think of the different parts of my body as cities! They might as well be, so much activity from so many minuscule parts is always going on within it.
Anyway, thanks again for this thread and I'll be coming back here.