PNF Stretch: Calf

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Comments
Hi David,
are you supposed to keep your knee straight? I couldn't 100% tell what you were doing in the video. I also seem to feel this almost fully under my knee and a bit more in the hamstrings, and fairly little in the calves. Any idea what I might be doing wrong?
This helps my plantar fasciitis. Thank you, David.
Proprioceptive Neuromuscular Facilitation.
What does PNF stand for.? Thanks