This video animation is the "classic" (well known) Sūrya Namaskār with Mantra chanting. 

Read this article on meanings of these Mantras - their loaded meaning indicates that we are deifying the Sun as "god", which may sit well with some practitioners.

Or may not if they are not comfortable with pre-formed devas as psychic intelligences, in which case Beeja Mantras would be a good alternative, for they can grow into the form of the recipient.

In either case, the "spirit" of the Mantra will inpsire you, and hence this is a spiritual process.

There is another amazing one which is truly ancient, someday bears recording also.