A spine that is ready for action and can achieve movement without risk of injury is referred to as:

A spine that is ready for action and can achieve movement without risk of injury is best described as a balanced or neutral spine. This position is characterized by the natural curvature of the spine being maintained and represents an alignment that allows for optimal stability and mobility. When the spine is in this state, it can effectively absorb forces and distribute loads during movement, minimizing tension on the muscles, ligaments, and discs.

Maintaining a balanced or neutral spine is essential during physical activities as it promotes proper biomechanics, which not only enhances performance but also significantly reduces the risk of injury. It forms the foundation for proper posture and movement patterns, allowing the body to function efficiently across various activities, whether in fitness or daily life. In this context, a balanced spine is vital for individuals to execute exercises and movements safely and effectively.

Other options like a flexible spine, while denoting the ability to move, do not necessarily correlate with stability and alignment. Similarly, a strong spine implies muscular strength rather than proper alignment. An aligned spine emphasizes alignment but lacks the broader context of dynamic movement readiness inherent in a balanced spine.