What is a sign of inadequate fitness/conditioning related to injury risk?

Lack of cardiovascular endurance is indeed a significant indicator of inadequate fitness or conditioning, which can correlate with a higher risk of injury. Cardiovascular endurance refers to the body's ability to sustain physical activity over an extended period. Low cardiovascular fitness can lead to early fatigue during exercise, resulting in poor form and mechanics as fatigue sets in, making an individual more susceptible to injuries. This poor endurance can also affect recovery from other types of stressors and demands on the body, compounding the risk of strain or injury.

In contrast, increased joint flexibility, strength training improvements, and enhancements in coordination are generally associated with better fitness levels and a reduced risk of injury. Increased joint flexibility can improve the range of motion and potentially decrease the risk of strains. Strength training improvements help in building muscle support around joints, which can protect them during physical activity. Similarly, coordination improvements often lead to better movement patterns and mechanics, further reducing the likelihood of injuries.