Which of the following factors does NOT limit flexibility?

Muscle soreness does not inherently limit flexibility in the same way that other factors do. While muscle soreness can result from intense exercise or injury and may temporarily impact movement quality or range of motion, it typically does not change the underlying structure or elasticity of muscle or connective tissues over the long term. Conversely, connective tissues, age, and tight skin can all have lasting effects on flexibility.

Connective tissues, such as tendons and ligaments, play a crucial role in determining flexibility by affecting how muscles and joints interact. Age can lead to changes in the elasticity of muscles and connective tissues, often resulting in decreased flexibility. Tight skin, particularly if it is the result of conditions such as dehydration or injury, can also restrict movement and flexibility.

In contrast, while soreness may require a period of recovery and can cause temporary discomfort during movements, it doesn't alter the fundamental ability of the muscles and joints to stretch and move. Thus, muscle soreness can be seen more as a temporary setback rather than a true limiting factor in flexibility.