More likely the chair.
I have one I avoid.
When I forget and have a nap in it I get hours of neck pain.
Used to blame springers!
Shame wearing baggy shorts and a windy day don't have the same effect elsewhere
them there springer's are soooooo addictive
Combination of different factors. Shooting position, chair, being set in the same position for too long and most definitely ergonomics.
Try and concentrate on being as relaxed as possible at all times and take breaks and have a regular walk about / stretch.
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A couple of glasses of Laphroag 10 and a hot bath is a good cure