Learn how to apply a PNF Stretch. PNF => Proprioceptive Neuromuscular Facilitation. That's a combination of static, isometric and sometimes dynamic stretches. In this instruction I will explain hot to apply a PNF front split stretch. Of course you can also do PNF in different stretches. Stretching small muscles like the forearms or the calves with PNF is not recommended. Also be aware that using PNF every day can lead to overtraining, extreme soreness and injury. Find more stretching instructions, exercises and advice at stretching main.