Past life regression, which dates as far back as the Upanishads of ancient India, is the act of transcending everyday memory and drawing upon memories from past lifetimes.
This approach is rooted in the concepts of karma and reincarnation. That is, the idea that we do in fact die and are reborn countless times in order to experience multiple lifetimes, and that our actions in previous lifetimes directly influence the life that we are living today.
If you can accept this concept or even consider the possibility that it might be true, then it is easy to understand the benefit of tapping into hidden memories from past lives in order to provide us with insight into the life we are experiencing right now.
A less expensive and certainly less dangerous approach to experiencing past life regression than the options presented above is to use a brain entrainment technology like binaural beats.
Brain entrainment is a technology that uses sounds that can actually "tune" the brain to various the brainwave frequencies that it passes through throughout our normal waking and sleeping states.