CONCEPT
A primer on the major disciplines and how they differ.
A martial art is a training method organized around a ruleset. The ruleset decides which problems the art solves and which it ignores, and almost everything else is downstream of that. To read any discipline quickly, ask three questions: what range does it train, what is prohibited, and does training include opponents who resist at full speed.
Fighting happens at distinct distances, and most arts own one or two of them.
An art blind to a range is not a bad art. It is a specialized one. The public learned this in 1993, when Royce Gracie beat larger strikers at UFC 1 by moving the fight to a range they had never trained. The lesson was not that jiu-jitsu wins. It was that whoever controls where the fight happens is fighting a different fight than his opponent.
Matt Thornton's term for the property that separates training that transfers from training that does not: timing, energy, motion. A drill has aliveness when the partner is genuinely trying to stop you, at speed, with unscripted responses.
Training against resistance produces skill; rehearsing compliant patterns produces confident people who cannot execute. This is a property of the method, not the tradition. Judo, boxing, and wrestling are old and alive. Some modern systems are new and dead. Pressure testing is the variable, and it is visible from the door of any gym: watch a class and count the minutes spent against someone who is allowed to win.
Belts are institutional currency, not a measurement. They mean different things in different organizations and nothing across them.
"Too deadly to spar" is unfalsifiable, and unfalsifiable claims are the immune system of dead training.
Self-defense and fighting are different problems. Most of self-defense is awareness, distance, and de-escalation. The physical remainder tends to involve grappling, multiple people, or a weapon, none of which resemble a ring.
Effectiveness does not track the art's country of origin, its age, or its lineage story. It tracks how the room trains on a Tuesday.