During stretching, what is an essential guideline to observe?

Holding stretches without locking the limbs is essential because it helps maintain proper joint alignment and reduces the risk of injury. When limbs are locked during a stretch, it can lead to excessive pressure on the joints and potentially cause strains or sprains. Keeping the limbs slightly engaged allows for a safer, more effective stretch and helps to maintain mobility and flexibility without compromising stability. This guideline emphasizes the importance of listening to your body and respecting its limits during stretching, ensuring that the muscles are effectively targeted without causing harm.

While other options may suggest different approaches, they do not prioritize the safety and joint integrity that comes from not locking the limbs during stretches. For instance, while it's often advised to stretch when warmed up or to hold stretches for a longer duration, the core principle remains that joint safety is critical in any stretching routine.