Flexibility is defined as:

Flexibility is primarily defined as the ability to move a body part through a full range of motion. This encompasses the elasticity of the muscles, tendons, and surrounding connective tissues, allowing for smoother and more efficient movement. When an individual has good flexibility, they can perform activities more effectively, as their joints and muscles can reach their optimal positions without restriction. This capability is essential not only for athletic performance but also for daily activities, contributing to overall physical health and injury prevention.

In contrast, the other options describe attributes that relate to muscle function but do not specifically define flexibility. Power generation relates to how much force a muscle can produce, maintaining tension focuses on muscle contraction, and static muscle contraction refers to the activation of muscles without movement. These factors can influence flexibility but do not encapsulate its definition. Thus, understanding flexibility in the context of movement range is crucial for grasping its importance in sports medicine and physical fitness.