1 of the newer schools of tai chi made after the 5 most prominent family named schools is called Mulan Tai Chi

It was created by a woman with health problems after she used TaiChi to get better

She created her own form or dance routine

The main difference in her form that I have seen after watching the videos is the following

In the Yang Forms I have seen there are a lot of poses where the 2 hands are far apart from one another

But in the Mulan forms I have seen the hands are close together