In addition, different schools within Buddhism use prostrations in various ways, such as the Tibetan tantric preliminary practice of a 100,000 prostrations as a means of overcoming pride (see Ngöndro). Tibetan pilgrims often progress by prostrating themselves fully at each step, then moving forward as they get up, in such a way that they have lain on their face on each part of their route. Each three paces involves a full prostration; the number three is taken to refer to the Triple Gem. This is often done round a stupa, and in an extremely arduous pilgrimage, Mount Kailash is circumnavigated entirely by this method, which takes about four weeks to complete the 52 kilometre route. It is also not unusual to see pilgrims prostrating all the way from their home to Lhasa, sometimes a distance of over 2000 km, the process taking up to two years to complete.