Astatic stretch is
safe, because it requires a partner or machine for assistance
safe, because it stretches the muscle and joint without causing pain
unsafe, because it involves holding a position for 15-30 seconds
unsafe, because it uses the body's momentum to stretch the muscle

safe, because it stretches the muscle and joint without causing pain

Explanation:

Static stretching involves stretching the muscle in isolation to the point of feeling mild discomfort, not pain. For this reason, we can say that static stretching is a safe practice because it stretches muscles and joints without causing pain. The position is usually kept motionless for a period of time that can vary between 15 and 30 seconds.

A simple example of static stretching is that of the tendon. Generally, to perform, you sit on the floor, extend your legs forward and bend over, trying to touch your toes with your hands. During the movement you can feel the muscles in the back of your thighs stretching.

When static stretching is done correctly, it can greatly improve your flexibility.

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