I did stuff like that back in my RHP days, can attest to feeling of personal power from it. “Back in” does not btw mean “less evolved” or “one day you’ll be where I am” or bullshit like that, just a reference. I went there to get to here, and retained some of the exercises, others I’d find very difficult even now.
Btw I think your topic title doesn’t adequately describe the interesting material in the post, and may cause people to overlook it? 