Situational awareness is key.
Training for something other than gunplay is also key.
Martial arts, ANY, is better than not being trained at all.
I've seen old Tai Chi dudes kick royal buttock...you'd never imagine they could
So join the nearest to your home, or the one that you think looks the best...doesn't matter.
Just get trained. You can always get More training. Learn the basics, then improve.
Find what works for you and learn it inside out.
Next...weight training.
I'm here to tell you that it is a huge help, just don't go overboard.
Low Weight, High reps. Low weight, High Reps. Low Weight, High Reps. Make it your mantra.
Used to be massive, as in Lou Ferrigno massive...
now due to High Weight, as many Reps as possible, I've got Degenerative Disc Disease.
Found out the same results could have been achieved by supersets and low weights,
and there would have been no DDD, no pain, and a better health outlook for my Golden Years.
And unless you WANT heart problems, don't mess with Steroids.
Ever wonder why all those Pro Bodybuilders & Wrestlers kick off around 50??
That's Why.