Worship isn't something we do on Sundays alone. We are so wired by our Creator to worship that if we don't worship Jesus, we'll worship something else (ambition, money, freedom, happiness, recreation). We literally 'have to worship,' When we sing, it is worship. When we give of our time, talents, and treasures (money) it is worship. When we pray quietly alone, we are worshipping. When we open the Bible and study it, in groups or on our own, we are worshipping (or gratefully giving honor to God for who He is and what He has done).