I took classes in Tai Chi (the simplified 24 forms, but in Chen style) some years back. Unfortunately I didn't have the opportunity to practise for a while after I stopped and then I couldn't remember it correctly.
By a stroke of luck (for me anyway) I was usually the only student present and therefore got private tuition for a group price. The teacher was a martial artist from China, which was great, since he explained the moves by showing me what strike/kick/etc they were mirrowing or by explaining it from a sports point of view (source of movement, balance etc). Somethings are based on Chinese culture, which he also explained. It makes sense to me if explained in that way (can't stand the touchy-feelgood explanations!).
During that time, I practiced the whole thing twice a day and made up exercises to help me reach some positions, which I did whenever I was bored of the books. So it's no surprise the difference in strenght, mobility and balance was quite noticeable afterwards.

They say the grass is greener on the other side
-- but have you ever flipped it over?
The Jean-Paul Sartre cookbook: "Today I made a Black Forest cake out of five pounds of cherries and a live beaver, challenging the very definition of the word cake."