Final answer:
In plyometric exercises, the three proper phases are the eccentric phase (loading), amortization phase, and concentric phase (explosive action). The 'Explosive phase' is not one of the standard terms used; 'concentric phase' is the correct terminology.
Step-by-step explanation:
Plyometrics, often known as "jump training" or "plyos," are exercises in which muscles exert maximum force in short intervals of time, with the goal of increasing power (speed-strength). This training focuses on learning to move from a muscle extension to a contraction in a rapid or "explosive" way, such as in specialized repeated jumping. Plyometrics are mainly used by athletes, especially martial artists, sprinters, and high jumpers, to improve performance, and are a key training component for many sports. A typical plyometric exercise involves three phases: the eccentric phase (loading), the amortization phase (time between the end of the eccentric phase and the start of the concentric phase), and the concentric phase (explosive phase).
In this context, the options given represent the phases of a typical plyometric exercise. However, the plyometric phases should properly be referred to as the eccentric phase, amortization phase, and concentric phase. Therefore, the Explosive phase, while descriptive of the concentric movement, is not commonly considered one of the standard phases of plyometric exercises. Instead, the concentric phase is the term generally used to describe the action of explosively contracting the muscle.