Worship of the Lord may be of a physical nature like puja,
or serving the society as a service to the Lord. At the level of speech, one
worships by singing the glories of the Lord. At the mental level, by thinking
of His divine form, qualities and sports.
Repetition of the name of the Lord, either loudly, softly or
mentally is called Japa. The chanting may be of various names or a single name
of the Lord.
The above practices are meant to make the mind pure, subtle
and concentrated and strong; as well as prepare the mind for meditation and
should be practiced diligently.
Swami Tejomayananda
If you do not have puja materials to do the worship, you can
conceive them in your mind and in your thought; you offer it to the Lord.
Swami Tejomayananda