[nandkeypull]

If you can find a competent instructor from a lineage that preserved the fighting applications of tai chi, you can see some pretty interesting grappling and joint-locking techniques. It's not all snake oil.

One example (Yang-style tai chi): https://www.youtube.com/watch?v=kp2jWeaKrqI

[leashless]

Here is a pretty good example of a very large trained fighter and a very excellent and much smaller tai chi guy going at it reasonably hard (like maybe one of them walks away with a concussion type hard).

https://www.youtube.com/watch?v=7D5DGpORANE

I think that's a pretty good example of what "people who can actually fight well use tai chi techniques" looks like. A lot of force is going into those throws, bodies are flying, and they aren't students doing a demonstration for a crowd. Legit.

[omega3]

It's better than most of bullshido videos but it's obvious that the greco wrestler is acting and not really trying: no head control, no wrist control, high center of gravity, dramatic throws.

[bobbruno]

That "very excellent tai chi fighter" is, if I'm not mistaken, Chen Ziqiang - son of Chen Xiaoxing and nephew of Chen Xiaowang, part of the family that the Chen style comes from. He's the current master of the original Chen village school of Taijiquan, one of the biggest winners of Chinese push hands and wrestling championships (for his weight) and one of the most serious practitioners I know. I've been there and seen it, it's lots of heavy exercises, hours of daily practice and sparring.

He is indeed excellent, but if that is the level it takes to use Taiji in practice, you won't find many people in the world who can.

[leashless]

I have heard it takes roughly ten years of practice of tai chi to be able to fight reasonably effectively using tai chi principles, assuming you have a very workable base of kung fu or something equivalent established (say ten years) before that.

If it's just about learning how to fight really really fast the WW2 combatives courses seem to be the best available system. I don't think any martial art is suited to the speed and directness of modern life.

[nemo]

My Tai Chi teacher (Yang Family) is also an Aikido teacher and he teaches Tai Chi as a martial art, interpreting the form in terms of blocks, grappling moves, joint locks, etc. He learned at least some of that from earlier Tai Chi teachers who treated it as a cryptic martial art.

[stronglikedan]

Honestly, it still looks like it could only defend against an opponent that moves in slow motion.

[nemo]

The purpose is to practice slowly with care to learn the moves thoroughly so that when it's time to perform them quickly you'll know the form and can flow quickly - the teacher was showing slow demonstrations.

I've never fought anyone, but as I've been taught the moves in Tai Chi's martial technique are generally intended to put people down quickly and hard by doing things like breaking elbows, eye gouges, and other grappling intended to severely injure the other party, essentially breaking every MMA rule that would get you disqualified.

This all varies significantly depending on the teacher, my teacher studied Chinese grappling, Mongolian wrestling, Aikido, and other arts that I'm sure he brought elements in from.

[leashless]

https://www.youtube.com/watch?v=vc3Q6vqvemA this is pretty much what high level skills in Tai Chi look like. You can see that it's mainly very, very secure footwork and explosive coordinated force delivered when the opponent is off balance -- this is a grappling situation but the logic is pretty similar if they were hitting each-other or even using swords / spears.