What Are Appropriate Acts of Worship?

What are proper bodily postures we should have when we are worshiping God? What expressions should we give in our worship? We need to be sure that our bodily postures and expressions are true reflections of our heart. We don't want to contain our emotions when we genuinely want to worship and give thanks to God, but we don't want to be like the hypocrites and give outward expression to be seen by man.