Many people complain about the lack of resistance in the training they see from the Bujinkan, the compliance in the uke, and the ludicrous LARPing that goes on. They feel that the techniques won't stand up to resistance or a noncompliant adversary. However, they miss a few points. I will explain why resistance is futile, when faced with someone who understands the human body and has mastered the techniques. The premise, is that the person demonstrating has gone through the levels of training that it took to master the material of the ryu and has internalized it(someone like my master for example). This is the dirty secret that is never discussed but is integral to making things work(kind of like ryutai undo). The first issue is perception. Most of the waza are created to leave holes in the opponent's perception, creating time and opportunity to work. Strikes are directed to blind spots or come from unconventional angles and are hard to perceive. Locks, throws, etc. work on leverage and using mass instead of gross motor function. For example, instead of grabbing(which requires will and force to be exerted through the grip), hooking is preferred. If your grip fails, there is an instant delay before you can change to doing something else, whereas hooking can become striking or blocking without the time loss. Resistance requires perception, an ability to resist, concentration, works in a single plane(power and body dynamics require a force to be exerted in a particular direction for a particular duration to be maximal), a root or base from which to exert force, and most importantly, requires that the person resisting lose the ability to do something else with the muscles they are using to resist. In other words, it takes time and effort to do. So how do you take away the opponent's ability to resist? You have to be able to make your moves work on contact(some pre-contact as well). This requires a better ability in timing, angling, better recruitment of the body's natural power(leverage, gravity), and the internalization of technique and skill so that it is unconsciously active. The I in movement has to be gotten rid of. You are not taking power and speed out of the equation, but replacing smaller power and more obvious speed and tension with mass(body power), and faster movement through the deletion of your own resistance to the movement(since your own tension requires you hold back). These things trump the opponents tension and resistance through better strategies. This last point begins in the foundational training but is concentrated on after the godan test. The moves are performed enough times under enough different conditions(yes this requires years of practice and stress testing) that they happen without willing them to. This is the "it hits" concept and is not restricted to these arts, many top level practitioners from other arts will demonstrate this ability. There are some other things that are included that make resistance a non-issue, including ki and the manipulation of the opponent's structure, but some secrets are better left unspoken. This introduction is enough of an explanation to describe why resistance isn't an issue and also why adding physical tension and power to technique only negates the technical application once a certain level is reached. Whenever I have tried to actively resist my teacher's technique, the same thing happens every time, it puts me in worse trouble and pain than I was already in. This doesn't mean that the strongest man in the world or someone better than me wouldn't be able to resist, as the failsafe switch is always to change to something else when what was being applied doesn't work to the satisfaction of the body. In the case of a master, the instant is all that is required to move on to something else, and while the opponent is momentarily off-balance, extended, out of position, bewildered, or resisting, they are already caught in the trap. Again, this discussion is of the art at its height, and there are only a handful of individuals that actual can put these concepts into practice. As a matter of fact, they have all gone through the stages of practice, trial and error, injuries, and deep introspection and pain to make it to this level, so anybody claiming that they don't need power or correct technique or kamae or basics, is just talking about this in the abstract, not from personal experience. Just to reiterate, this level of skill(as far as I know and have experienced) cannot be reached without a lot of testing, practice, use of power and tension, and tweaking until one can get to a point where a breakthrough is made. Doing training with armhanging compliant uke without any resistance, speed, or variation will never allow one to reach this level.