Do not impose on somebody's personal space without first getting their permission.
Be reasonable, responsible and mature, and choose to hug only so you both are better off for it.
Make eye contact, spread your arms to your sides, smile, and say: "May I give you a hug?"
If the answer is no, you are entitled to one "Are you sure?" for confirmation. If the answer is still no, move on. It doesn't mean anything other than the person does not currently wish to be hugged. Remember that the other person may not be as inspired as you, and maybe you should show them the website first.
If the answer is yes, take a step towards them and hug them. It is recommended to tilt both heads to the right, so that your hearts face each other.
When appropriate, stay hugged for at least 30 seconds. To get the full benefit, you both need to break through the first few superficial seconds. Usually after 3-5 seconds you feel an urge to separate. Sometimes that's exactly what you should do. But if you feel close to the other person, enjoy it! Resist the urge to let go and continue to hug each other. It helps to take a deep breathe and consciously inhale the energy generated by the hug.
For more info, take a look at the Cost/Benefit Analysis.
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