Most techniques, need strength of arm. Knife, sword, fist, palm, pole, spear. All of them need great arm strength. Look.
15 seconds sound clip from the Frozen movie soundboard.
You can hear this line at 00:50:23 in the DVD version of the movie.
Quote context
[...]
- Now bear that in mind. It's important.
- Speed, balance, weight, that's right.
- Leave.
- This practice is the basic one.
- You aim to keep the water flowing down after carrying it up.
- It's important not to break the flow.
- Now always keep arms level. Shoulder straight.
- You'll have to carry the water for many days to build up your arms.
- Sir.
[...]