Stick your hands up to the wrists in the water of a highland burn for about as long as the chappie was dookin’ in the video at #15 and your circulation will be usefully stimulated for the rest of the day, dry cold down to minus 10 to 12 isn’t anything to complain about, wet damp cold around -1 to plus 5 or 6 deg is where the real miserable cold is (maybe it’s a regional thing!).
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…or you can make do with a couple of ‘pocket warmers’ in yer tweeds - that’ll stimulate the circulation too

nae need for mountain rescue, I’m feeling fine, thanks!