Hullo! 
My Christian friend has already answered this question for me in his own terms, but I'd like to broaden the answer to include Christians from a whole range of backgrounds, countries and religious denominations.
So, if you don't mind, would you please tell me what worship is to you? What's your "technical" explanation of it, and what's your "emotional" explanation of it? How do you, specifically, choose to worship?
Thank you. 
In some ways this is a really complicated question with a complicated answer, largely perhaps because so many of us of faith take it so for granted as a "given" that we don't always spend much time extrapolating it into a refined answer.
I'm a word nerd, so I often like to look at the etymology of words and how they have evolved over time. In this case our word "worship" is a compound of worthy and -ship; that is the state or condition of being worthy. Worship is, archaically speaking no a verb that is "done" but is a noun that is
given; or a noun that describes a subject. For example the archaic honorary of "your worship". Therefore we give worship to an object (whether it be a person, thing or deity, etc).
It's actually fairly generic, though today is usually exclusively used in reference to acts of homage and reverence offered to the Divine. And because of this can get really confusing, especially in inter-Christian dialogue between Protestants and Catholics/Orthodox (similar to confusion over the word "pray").
Traditionally two concepts have been rendered as "worship": Latria and Dulia.
Latria is a familiar word, as it forms the suffix for the word idolatry, which literally means "the adoration of idols". Latria refers to adoration, and is defined in the Christian tradition that form of reverence which is due exclusively to God and no other. Only God is worthy of adoration, worthy of the highest honor and highest glory.
Dulia is a less familiar word, but can be found in the word icondule (one who venerates icons, in contrast to iconoclast, one who breaks icons). It is derived from the Greek doulos, meaning "a servant", and refers to the respect or veneration which a servant bestows upon one's master, or the veneration one offers a king or person of authority. When a nobleman would kneel before the king, it was an act of dulia. In Christian tradition dulia is the honor paid to the Saints (including Mary), or to that which is sacred (such as icons or relics). The honor which a child gives to his/her parents is dulia, the honor which one shows a statesman, dignitary, or even just their employer is dulia.
The focus here, of course, is on the former: latria or adoration. Worship, that is adoration/latria, is that which we offer in word, action or deed which bestows the highest worship, offers our highest praise, makes known that God is of the greatest worth to us. We do this through prayer, song, gesture (prostrations, genuflections, the lifting up of hands, and any other assortment of reverent gestures); we do this by our participation in the corporate act as the Church when we gather for our liturgy and/or service, by partaking of the Eucharist (and that alone could probably be a completely other topic), and ultimately by the very way in which we live our lives day-in and day-out.
Thus worship is not one thing, it is a multitude of things, it is a wide array of many things which are done out of our adoration and highest reverence for God as we manifest our acknowledgement of His greatest and highest worth above every other thing conceivable.
That, in a nutshell I think, is how I'd answer this question.
-CryptoLutheran
