Looks like the attached picture. Only affects it at the end of a hard interval in a workoput. Disappears as soon as I go through the barrier into the easy bit and only starts about a minute or so before the end of the interval…
Workout pain effect in the settings menu 
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Cheers Mate, I’ve been putting up with this for over a year and no-one has answered until now. Really grateful. 
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I don’t know where you’ve been asking, but this comes up from time to time on the forums here and I’d ve very surprised if you didn’t recieve an answer here before.