My problem is, I've never found plain running fun to do. I don't have weight problems, but I should excercise more to keep fit otherwise. Now that we have proper winter, I can go skiing or skating and with a bit of traveling, downhill skiing is possible too. I know from skiing, there is this limit, you are talking about. I just have to get past that and myself warm enough and it will become more enjoyable. It's also dependable very much on proper breathing, I think.
But really, I'm not in that good shape and my goal is mostly to get me start any excercising, so I don't try to push it. We use to say: 'it's not the distance that kills you, it's the pace'.
I'm not sure though if slowing down the pace would help you carry on further.
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