The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

You are the bravest one,
aren’t you, ATHLETIC boy?
Money Heist Season 1, Episode 10

Peppermint Patty's just ATHLETIC.
The Big Bang Theory Season 2, Episode 3

I wasn't ATHLETIC.
Yeah, I was kind of sickly...
The Big Bang Theory Season 4, Episode 4

- Pick another game.
- Why don't we do something ATHLETIC?
The Big Bang Theory Season 6, Episode 4

...in helping us re-create
an actual ATHLETIC experience.
The Big Bang Theory Season 4, Episode 20