Our expert says:
That can be due to tension when running. The arms and shoulders can cause this if tight, and so that's likely the cause. You need to look at how you carry your arms, lower them if possible, relax. Relaxation is a tricky thing because the more you focus on relaxing, the more difficult it is. But if you can relax from the face down, then you have a better chance of avoiding this.
It is common, though, and it's almost always due to tension in the shoulders and neck. Unusual that it's new for you, makes me think that maybe there's something else that recently happened to cause a bit of tension in the shoulders, maybe a slight muscle spasm or knot that just needs to be worked out. Which means maybe you can accelerate relaxation by seeing someone to massage it out. It'll hurt, but it usually helps!
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