>>76451339
Yes, I train flexibility.
For striking martial arts especially you are going to want good dynamic flexibility. That is best improved by doing dynamic stretches.
The best method for improving static flexibility is proprioceptive neuromuscular facilitation (pnf) stretching.
The best resource on both of these things I know of is Stretching Scientifically by Thomas Kurz.
The book lacks diverse position examples, so I would recommend the book Stretching and Flexibility by Kit Laughlin as an addendum.