What is used to increase the extensibility of soft tissues through both autogenic inhibition and reciprocal inhibition?

Static stretching

Explanation:

Autogenic inhibition and reciprocal inhibition occur when Golgi tendon Organ is activated leading to inhibition of certain from contracting.

Stretching is a form of exercise that improves muscle's felt elasticity by deliberately flexing it.

Static Stretch entails singular motion held in a place for ten seconds or more and it is used to increase soft tissue extensibility through both Autogenic and Reciprocal inhibition.