Always interesting to read the backgrounds, habits and feats created by similar wannabe vigilantes (I'm >>68181668
I'm still training myself as, unlike you, my physical condition has never been all that great. I anticipate within the next few years, I will have done enough training and research to at least have some success for early efforts.
As far as training, I have a 4-day PHUL style lifting routine (won't post my stats because my strength is dogshit), an alternating routine for cardio where I change between MISS like jogging and HIIT of different activities (primarily sprints, carries and sandbag/kettlebell work). I practice striking with some boxing, taekwondo and escrima a few times a week, and will be enlisting in some grappling courses soon. For agility, I also have a calisthenics routine I typically employ on non-lifting days that is primarily skills focused (static holds, some explosive movements a la tricking). I keep things flexible in the routines in order to not get too stagnant, but still maintain momentum in making trackable progress.
What was the realization point that made your desire to change the world more introspective? I find my sense of autism won't let me give up this path unless I'm injured/ill beyond all acceptable function for the work.