"True worship is God-centered worship. People tend to get caught up in where they should worship, what music they should sing in worship, and how their worship looks to other people. Focusing on these things misses the point.
Jesus tells us that true worshipers will worship God in spirit and in truth (John 4:24). This means we worship from the heart and the way God has designed. Worship can include praying, reading God's Word with an open heart, singing, playing and instrument, participating in communion, and serving others. It is not limited to one act, but is done properly when the heart and attitude of the person are in the right place.
It's also important to know that worship is reserved only for God. The truth is we all worship something and this is why one of the Ten Commandment s tell us to worship God alone -- because it is essential in our relationship with the Lord."
http://www.gotquestions.org/true-worship.html: