Physics or ability for self protection
Self protection. Today it requires one to be able to stand for oneself. Nowadays so called UFC fighters are well rounded in such forms like kickboxing, have a good stance with reach in length and grappling skills. Nothing else is needed. Technically and practically one can use his own weight repulsing out from the ground. One should remember that, in the street confrontation between people the most solid and heaviest object is the ground. Winner is the one who would be able to effectively and in time preserving bridge an aggressor with the ground. If one is bare handed, the most effective and practical stuff is kickboxing and grappling.
Practitioners will understand why. I omit the case where one has heavy fittings in one’s hands, where it adds an additional weight to one’s favour, or firearms where it ends up much faster. In some States, it is a right to have a firearm for a person for variable reasons.
Reasons to stand and protect oneself, which had been declared in the Second Amendment. The only thing that really concerns is that disabled people may become victims of unpredictable situations, where everything might happen to them.
Consider the self protection as an important aspect of your life.