Our expert says:
Is there any chance it's caused by a change in diet or even in the timing of your food intake? Perhaps you're exercising sooner after eating than before? Or possibly later? Either could contribute to this problem, so you might need to play detective and figure out if one of those is an option.
As for the breaking down, that's one way to manage the training in the meantime, while this is still a problem. Obviously, you want to sort out the cause and not just avoid it, so you might want to see someon and see if they possible ulcer issue is a consideration here. But you can walk for roughly the same amount of time, but really try to sort out the cause.
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