Tin Shan style requires strong leg muscles. You need to walk with these lead shoes, till your legs can keep perfect balance.
12 seconds sound clip from the The Woman Avenger (1980) movie soundboard.
You can hear this line at 01:07:21 in the DVD version of the movie.
Quote context
[...]
- But there must be some way to defeat it.
- And you must also learn my special kicking technique, which is know as Tin Shan Feet.
- Both together we can defeat him, believe me, it is possible for us to defeat him.
- Sister, will you teach me the Tin Shan style?
- You must develop the ability to kick fast.
- The Ox tendon is strongest. Push your legs against it as far as you can. Keep practicing.
[...]