There are 12 basic steps of surya namaskar. These steps vary with different types of surya namaskars.
Step 1: Pranamasan
Stand in an erect position, facing the sun, with palms folded near the chest in namaskar. Keep the feet together and breathe normally.
Step 2: Hasta uttanasana
Breathe in, raise the arms upward, and bend backwards with the face pointing upwards and towards the sky. The back should be arched while bending backwards.
Step 3: Pada hastasana
Exhale and keeping knees straight, bend down till the head touches the knees. The hands should touch the floor on either side of the feet with the palms flush against the ground.
Step 4: Ashwa-sanchalan-asana
Inhale and stretch the left leg backwards, and balance the leg on the toes with the heel raised upwards. The right leg is bent at the knee and the head is lifted upwards to face the sky, while the hands remain stretched with the palms flush against the floor.
Step 5: Parvatasana
Exhale and keeping the palms flush against the ground, the right leg is pushed back to stay parallel with the left leg. The hip is raised with the head bent downwards to face the navel.
Step 6: Ashtanga namaskar
Inhale and lower the hips. The toes, knees, chest, and face touch the floor while the hips are slightly raised.
Step 7: Bhujangasana
Exhale and stretch arms. Lift the chest so the back arches and the head is bent backwards to face the sky.
Step 8: Parvatasana
Exhale and perform as in step 5
Step 9: Ashwa-sanchalan-asana
Inhale and perform as in step 4
Step 10: Pada hastasana
Exhale and perform as in step 3
Step 11: Hasta Uttanasana
Inhale and perform as in step 2.
Step 12: Pranamasan