What type of stretching requires targeted muscle contraction and relaxation against resistance?

The type of stretching that involves targeted muscle contraction and relaxation against resistance is called proprioceptive neuromuscular facilitation (PNF) stretching. This technique typically involves a partner or a therapist applying resistance while the individual contracts a muscle, followed by a period of relaxation and stretching. PNF is effective for increasing flexibility and improving range of motion. It combines passive stretching and isometric contractions to enhance muscle elasticity.