In order to ready anyone, you must understand their body language. You can instantly discover many things about someone by just noticing their subtle body language cues.
Sources:
The Key to Understanding Body Language
https://www.psychologytoday.com/intl/blog/spycatcher/200910/the-key-understanding-body-language?collection=73794
The Honesty of Body Language
https://www.psychologytoday.com/intl/blog/spycatcher/201108/body-language-basics?collection=73794
The Once-Over
https://www.psychologytoday.com/intl/articles/200405/the-once-over?collection=73794
Body Language: Using Your Body to Communicate
https://www.psychologytoday.com/us/blog/the-shameless-psychiatrist/202103/body-language-using-your-body-communicate
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