What kind of stretching involves a contraction followed by relaxation?

The correct answer involves a technique known as Proprioceptive Neuromuscular Facilitation (PNF) stretching. This method typically includes a sequence where the muscle is first contracted isometrically (without changing its length) and then allowed to relax. The contraction is intended to enhance the stretch experience by activating the muscle spindles and golgi tendon organs, which helps to promote a greater range of motion. When the muscle subsequently relaxes, it can often stretch further than it could with standard stretching methods.

PNF stretching is commonly used in rehabilitation and athletic training because it not only increases flexibility but can also improve strength in targeted muscle groups. The contraction prior to the stretch takes advantage of the body's natural response to relax the muscle afterward, leading to improved efficacy of the stretching.