Some martial arts are Taoist spiritual practices which are practiced daily. These martial arts are referred to generally as Neijia.

The same way other styles of Kung Fu have, namely in that many myths and misconceptions have arisen surrounding it. Far as nonfiction, in China like here, Tai Chi is stereotyped as "old folk's exercises." Indeed in most parks around the world, most of the people you will see doing Tai Chi tend to be elderly, people like me, among others, are extremely rare (people in their 20's who do Tai Chi).

Tai Chi Chuan has become widespread in China, and although what is said to be the "Yang style" is practiced by millions across the world, only a minority of people practice the full Yang Long Form, and from that minority, an even smaller minority practice the applications and from that minority, even smaller stalle, practice it as an outright martial art. The main way it has affected Chinese culture, I would say, is the cliche in Chinese cities that "that man must have retired from his work; he's doing Tai Chi." In China, if a man is seen doing Tai Chi in a park, it is a surefire sign that he is retired. It has become cliche in China, that Tai Chi Chuan is the "retired man's martial art." Having nothing better to do, many Chinese retirees spend their day playing Go!, and doing Tai Chi.

Another effect of course are the "Neijia" internal martial arts novels. A particular genre, are all the Wudang styles. The most famous is "Crouching Tiger; Hidden Dragon" the style practiced by Li Mu Bai (Chow Yeung Fat's character), is in fact the Tai Chi sword, which specific style, it looked like the Yang, however likely it was probably the PRC's sports commission "synthesized" style which is in fact an amalgam of many different sword techniques drawn from various styles of Tai Chi, even a few exotic ones unknown in the west. The reason the martial artists in "Crouching Tiger; Hidden Dragon" seem to be able to "fly" when they jump, is because one of the things incredibly strong chi will do for a person, according to legend, is "make them so light, they can walk on water." When the chi is circulated strongly, and it circulates with potency, the person can jump great heights, and even stand on bamboo stalks as shown in the movie without crushing the stalk beneath their heel. All the "flying" stuff in that movie, was the effect of their chi. However in China it is considered a myth, even among the likes of Shaolin monks. Even though the Shaolin temple acknowledges the existence of Chi, and many do indeed do demonstrations showing what resiliency it can give the skin by resisting cuts, punctures, and blunt damage, even men or women capable of such feats will generally warn, not to take such legends too seriously. The reason that is is because there have been many tragedies surrounding people who deluded themselves into thinking that their chi had given them supernatural ability.

Ultimately, with any fighting style it ultimately boils down to the practitioner's own willpower, intellect, and work ethic, tragically REGARDLESS of character. In martial arts fiction, who do you think it was inspired the villains? Its possible even for a very bad man, to have an exceptionally strong will, always a dangerous situation. Whole reason why martial arts "super powers" are considered a myth, is because to achieve the kind of things you see in anime, video games, and high production values special effects driven movies, the power of your will has to be match well, the power you want. The more personal power you want, the stronger your will needs to be. As a general rule considered myth because of the idea that NOBODY, is that strong-willed.

In Japanese video games the reason you see the word "will" so much, is drawn from their culture and folklore. Namely legendary, well, ninja and samurai, whose will became so strong, they achieved superhuman powers. Basically with every fictional character you see in games, the developers assume they are that strong because of a strong will. Ultimately, in the real world, the strength of a martial arts style really depends on how it develops you, the individual. How well it helps you cultivate, and strengthen willpower.

In the end though without the ability to hold the difficult Ma Bu stance

For at least 2 hours, without pain mind, mastery of any kung fu style or any east asian style is impossible. REAL mastery; given modern life, schooling, work, how money and technology driven modern life is, very few people have the discipline to set aside 2 hours to hold that position. If you MUST know which FAMILY of styles is considered the most powerful in China, it would be the neijia, or "internal" styles, of which Tai Chi Chuan is a part. Tough to swallow I know, that all those slow motion movements, sometimes absolutely no movement at all can grant "ultimate martial arts power" but in China its conisdered true. Still though the direction of the energy they call "chi" is will-driven. Without a strong will, training in any kung fu style is useless, ANY fighting style really.

However if we are going to get into an "all things being equal" thing, one guy knows Kung Fu, the other guy does MMA, the strength of their will is the same, Kung Fu guy will win believe it or not. The vast majority of traditional practitioners the MMA world has encountered have been, overwhelmingly weak-willed individuals. MMA fighters haven't exactly been in there with Shaolin monks

also don't listen to the moron who posted this thing. At precisely 24 seconds you can see the monk's hands, are not moving with choreographed precision. He just kind of, waves his hands, but does not block the kicks with exacting precision. Not wanting to nitpick but both practitioners make several mistakes, they get sloppy in places, although I'm sure an expert would be better able to see it. If you show this video to a 10th dan they will confirm with their expert eyes, this video is NOT choroegraphed. Call it racist western nay saying; the a-hole who posted the video likes to think, western made MMA is indestructible. Let them ride the ego train; doesn't make it true.

Still though, not denying the point, that assuming an MMA guy was capable, that if THEY held Mabu for 4 hours THEY would probably be really tough themselves. Think man, Shaolin training combined with Mixed Martial Arts? Gives ME the goosebumps. Again though in most circles "ultimate power" is chalked up to superstition, and if you happen to believe that stuff best keep it to yourself. But what if you really DO learn how to fly, like superman? STILL, keep it to yourself. Seriously man you run around publicly talking abou chi energy and ultimate martial arts super powers its a quick trip to the looney bin. Although in this era of internet weirdos, people tolerate crazyness more. Anyway to more directly answer your question nobody really knows, but in China, it is generally considered to be the internal, meditative martial arts, such as Tai Chi Chuan.