I second the recommendation of Somatics-- it's a good simple explanation of Feldenkrais Method, and the exercises are good for my lower back.
I think there's a rejuvenating effect because Feldenkrais reverses a lot of accumulated movement habits, but it's plausible to me that gene therapy might have the same effect. On the other hand, we have Feldenkrais and we don't have anything like that level of gene therapy.
I like Somatics, but think that it's a very thin skim on what Feldenkrais had to offer.
Feldenkrais have very interesting stuff on volition and action in The Potent Self. Body and Mature Behavior is good too.
This is the question asked by John Cook on Twitter. He lists responses from different people:
Mine are: quantum mechanics, Python, cooking, the language of philosophy.
What learning curve do you wish you'd climbed sooner? Give reasons and stories if you feel like it. Do you think other people should climb the same curves?