I find the same thing when doing a strenuous photoshoot. A few years ago I was forced to take 7 months off with a bad sciatic nerve issue that required surgery. I was literally bed-ridden for a while.
After the surgery and physiotherapy - my first photoshoot left me incredibly sore and achy (especially in the arms and shoulders) from using muscles I hadn't used for more than 7 months. I tend to move around a LOT during a photoshoot - and it's taken some time to get back into the pace again.
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