Assisted stretching with Proprioceptive
Neuromuscular Facilitation (PNF):

PNF goes beyond the basic stretch. It is one of the most
functional and successful forms of stretching for clients,
because the muscle is lengthened and strengthened during
the contract and release phase. This technique is effective
for improving flexibility, stability, increasing range of motion,
and preventing injury. Being flexible can help you move more
freely and allow one to complete daily activities with less
chronic pain and promotes overall health and wellness.