Surya Namaskar i.e. Bow down to God Sun. It is in a specified way. It includes physical exercise, Yoga, Pranayam, Bandh s, Sound treatment. It has to be done repetitively, minimum 12 to 13 times.

There are thirteen mantras to be chanted before each Surya Namaskar.
1. Aum Mitraay Namah.
2. Aum Ravaye Namah.
3. Aum Suryaaya Namah.
4. Aum Bhaanave Namah.
5. Aum Khagaay Namah.
6. Aum Pushane Namah.
7. Aum Hiranya Garbhaay Namah.
8. Aum Marichaye Namah.
9. Aum Adityaay Namah.
10. Aum Savitre Namah.
11. Aum Arkaay Namah.
12. Aum Bhaskaraay Namah.
13. Aum Shree Savitru Surya Naraaynaay Namh.
Exercise gives treatment to body, Yoga also the same but more effectively, Pranayam gives more oxygen to lungs, Bandh s helps in enlightening of Kundalini, Sound treatment helps in all of these. It is sais that it is "complete" exercise. It gives fantastic result beyond our imaginations.

http://tribes.tribe.net/surya_namaskar