I moved from Transcendental Meditation (which I had learned previously) which doesn't quite get you into these states to concentration and insight according to this book and it got me there.
The author sheds no light in their state of learning or lifestyle. If I had to venture a guess, I would think that they play significant role..
Following Buddhist eight fold path as much as you can, serving the needy, leading a mindful life, and knowing the basics of mythology, philosophy, etc. probably will help.
I think that's an excellent point, though the author sets up the article in a scientific way, describing the practice as mechanical - a lot of the ability to access these states comes from coming into it with a wholesome and cleaned up mind, which comes about through doing wholesome actions, saying wholesome things (and not lying), and generally the practice of "sense restraint" - not allowing unwholesome influences into your life. Otherwise, you sit down and your mind is a well of negative thoughts and feelings that completely cloud your ability to access jhana.
Of course, if you're the sort of person that behaves, speaks and thinks that way in general, you may not realise that that's one of the main things that allow you to access the jhanas.
Physical exercise first can help one mentally calm down quicker.
Finally, studying others methods is helpful. The book "the six dharma gates to the sublime" was helpful for me personally for jhana practices, and there are lots of other great resources and teachers available if you look.
some of us just take a lot of work to get there. monkey brains maybe.
yes, there's a practice element, to do the dissociative steps well, to get the right body sensations amplified with the right mental ones, etc.
the start-up-y way is not better or worse for you if it works. the traditional way(s) work vy constraining as much of the circumstances as possible, so the originating mind state is "exactly" as the one the instructor had.
I've experienced both the Sutta jhanas (in a TWIM retreat) and the VM jhanas (spontaneously after a lot of practice). They're wonderful and the VM jhanas in particular really boost sensory clarity and concentration which is certainly helpful for insight practice, but a sustained practice or rather, sustained intention to practice well have been more helpful to me over the years.
This is just not true. There are athletes with sub 100ms reaction time. The average person is over twice of that. It only makes sense that there are meditative athletes whose abilities surpass those of the average guy.
there are at least a hundred[0] traditional techniques for meditation. one needs to find those that work. for someone with a highly monotropic autistic trait techniques that work with a singular focus are probably more well-suited, while someone with "kind of the opposite" (hello ADHD people) should try those that are more cognitively active, have mindfulness elements, and build rich imaginary worlds.
[0] 112 in https://en.wikipedia.org/wiki/Vij%C3%B1%C4%81na_Bhairava_Tan...