Isometric exercise or isometrics are a type of strength training in which the joint angle and muscle length do not change during contraction (compared to concentric or eccentric contractions, called dynamic/isotonic movements).Isometric exercises are contractions of a particular muscle or group of muscles. During isometric exercises, the muscle doesn't noticeably change length and the affected joint doesn't move. Isometric exercises don't effectively build strength but can help maintain muscle strength — often in a rehabilitative setting. Static exercises, also known as Isometrics, are a form of training where the body performs little to no movement while contracting its muscle fibers. Key benefits of static training are: Increased muscular endurance. Increased muscular strength. Isometric exercises, also known as static strength training, involve muscular actions in which the length of the muscle does not change and there is no visible movement at the joint The term 'static contraction training' is sometimes used to describe isometrics.