The amortization phase, or transition phase, is one of three parts of a plyometric exercise. This phase is the time between the concentric and eccentric phases. This phase of the stretch shortening cycle is perhaps the most crucial in production of power as the duration of amortization must be kept at a minimum. If the transition phase lasts too long, the energy stored during the eccentric phase dissipates, thereby negating the plyometric effect. Then it becomes just a standard exercise.