Tendai has several different practices which involve prostrations. Some seem to offer an opportunity to purify ones karma. Others, Like the 3000 Buddha prostrations are done as an act of veneration to the Buddhas
~ Regardless of your tradition, If you are doing prostrations, please tell me a bit about it. If not, please tell me a bit about that too.
i've done prostrations in the cycle of preliminary practices in Tibetan schools of Buddhism. i accumulated a sum in the course of about a year and half, and proceeded on to the next practices. speaking from my own experience, it was a very important practice.
done in this way, they are a practice of purification, as you say. but as we move along, there are more profound benefits, i feel.
i have continued doing them periodically, as a form of veneration and a yoga. i call it the "yoga of sweeping the floor".