Sparring or randori opens your static technique to a more realistic defensive environment. Is sparring essential for defending yourself? No. You can defend yourself with the techniques you have been shown. However, you are also relying upon an opponent in a defensive situation exactly replicating the actions of your uke. In reality this rarely happens. What is essential is learning how to adapt your techniques to fit a whole variety of defensive situations. You can do this with yourself or with a training partner. However, the most efficient way to open out your technique to the reality of a defensive environment is through randori or free sparring.Most if not all martial arts practice some form of sparring, but some systems of schools will not. For example, in self defense minded systems, sparring may be forgotten entirely in favor of running simulated self defense situations. That, and not all sparring is the same. For example in some ( I won't speak for all ) wing chun or FMA schools, the sparring is a very different affair than in Karate, muay thai, TKD, JKD, bjj etc etc.
Do you think sparring in it's traditional sense ( freely trading, parrying, and blocking blows ) is needed in martial arts?
I would appreciate your opinions.
As I see it, the technique is the theory. In self defence, randori is where the rubber meets the road.