Nod your head to make someone agree with you
There’s another human reflex that could help you out. Try nodding your head while someone is speaking to you if possible. This modest movement might help people feel more at ease and agree with what you’re saying.
Of course, employing this technique is only recommended if you agree with what the other person is saying. But if you come across a circumstance where you need to develop rapport fast, nodding your head can assist in establishing a sense of agreement.