Our expert says:
Have you tried to reduce the pace of those runs? Do you have an indication of the speed you're running at? Because it sounds as though you are not adapting to the training, which is unusual, but can happen if you are extending yourself too far. Also, how long have you been doing this?
Theoretically, if you slow the pace of the run sections down by even a small amount, you'll be able to run for longer, and that's probably what needs to be done.
If you still find that you're incapable of exercise, then it may well be worth seeing a physician, because there are some conditions that can lead to exercise "intolerance" and you might want to have those excluded from being possible.
But I think if you just bring the intensity down, run slower, it should help you get over this bump.
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