Worship, the feeling or expression of reverence and adoration; paying homage to royalty, is something we must always do as a Christian. True Worship can be seen in John 4:23, "But the hour is coming, and now is, when the true worshipers will worship the Father in spirit and truth; for the Father is seeking such to worship Him. 24 God is Spirit, and those who worship Him must worship in spirit and truth."
When we cheer for sport teams it is a confession or profession, this is my team. We admit they have our support and in most cases loyalty. Loyalty never happens unless that 'thing' has your heart. Some of us will, pay our body, tattoo our body, invest in clothing, or other materials to reveal our "worship" of the team we love.
Worship is very similar. True worship is a matter of the heart. It is an acknowledgment God has our heart and loyalty. It is an attitude admitting God, has our reverence. Our worship is our response to God for what he has already given us. It is also a response to how God has revealed Himself to be in our lives not only who HE is, but who He will reveal to be in the future. Our worship to God is a commitment and acknowledgement of his sovereignty, grace, and mercy. It is also a confession.