I posted this video of me doing Tai Chi in the rain back in 2012. This is a short form derived from the full long Yang form of Gu Ru Zhang (Ku Yu Chang) the famous “King of Iron Palm” from Hong Kong.
You see the famous picture of him breaking tiles without spacers quite a lot:

Gu Ru Zhang
Gu Ru Zhang’s style of Tai Chi is still quite rare. It’s from the Yang family originally, but had some input from his friend Sun Lu Tang, and you sometimes see it incorectly called Sun Style.
Gu published a book in 1936 on Tai Chi called “Tai Chi Boxing”, which you can find translated on the Brenan Translation website.
I’ve done various different styles of Tai Chi, but I always come back to this form. It’s my favourite. Anyway, here’s my video: