Static balance is the ability to maintain one's balance when not moving. It is also defined as being able to hold a certain position without moving. People use static balance all the time, and many examples can be found in someone's daily life.
Like when someone is standing at a stove and cooking a meal, for instance, could be an example of someone using static balance in a common context. This requires them to have static balance so they can stand at one spot for a period of time without moving or losing their balance.
Static balance is the opposite of dynamic balance, which is defined as the ability to maintain an equilibrium while moving through a space. People use dynamic balance when they climb ladders or when they walk on the beach. So, static balance has to do with the absence of motion and dynamic balance has to do with the presence of motion.
People can suffer with problems in their balance, whether it be static or dynamic in nature, for various medical reasons. Some reasons for people having trouble with their balance could be older age, issues with their central nervous system, muscle problems or decreased body awareness, which can be caused by bad posture, stress and inactivity. There can be other causes for bad balance, like arthritis, vision or hearing issues or hardened arteries, which is medically referred to as atherosclerosis.