There has been a trend of advertisements using Tai Chi as a 'hook' upon which to give the impression of a healthy lifestyle. Pictures like this....
....which really annoy me. Because instead of finding someone who actually can do Tai Chi, they wheel in some airbrushed model who does "Tae Bo" (boxercise) at best.
So when I get a bunch of students who want to look like her, they are going to be pretty disappointed, because Tai Chi is not about attaining an aesthetic. It is about quality of movement, posture and rooting. (none of which are exhibited above.)
All physiques are welcome, and no-one is asked to change.