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Turn completely towards the person you are interested in
Lean forward so that you are nearly touching
Maintain prolonged eye-contact
Sub-consciously you will start to display the following signs, indicating interest:
Your voice will become lower
Your breathing will increase
Your skin will flush

Stage 2 - The Pull-Back
Slightly withdraw from the object of your affections - this will make him or her unsure of their potential success and keen not to miss out on what's on offer:
The Pull-Back
Look away
Lower your eyelids
Use your hand to hide your expression

Stage 3 - The Block Off
The purpose of the block off is to ensure that they focus on you and you alone:
Change your position so your body blocks the person off from everyone else in the vicinity.
Men tend to stretch their legs out and women often use hand movements to create a barrier between the two of you and the rest of the room.
Use the person's name in conversation as this focuses their attention.

Stage 4 - The Promise
Touch him or her when you pass them something
Touch your face or put your fingers through your hair
So now you've got them hooked! Make sure you judge the situation and pace your next moves accordingly.
Good luck!
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