Because palmprints can reflect changes in a person's health, palmprints change with changes in physical health. This has been scientifically proven. You can see this by watching the TV program "Encyclopedia". Destiny is a natural law. It is a combination of people's subjective initiative and the influence and restriction of objective reality on people. People are capable of action and subjective initiative. A good body can help people exert their mobility more advantageously. Science was underdeveloped in ancient times, so no scientific explanation could be made.