Just to add, some martial arts groups use Aluminum training blades to train with
They are used to get users mentally prepared to be hit with a blade....being hit with a blunt metal blade hurts, but its ultimately better than being hit by a sharp steel one and gets you used to the mentality that you will be hit so how do you make it so it is less painful (or life threatening when you do get hit for real)
https://takknife.com/collections/keen-edge-aluminum-training...