Our expert says:
interesting one, not easy for me to just solve though, I would have a lot more questions. But I have some general things to raise and you can see whether they are relevant or not.
The first thing is that you have lost 9 kg, so I'm not quite sure why you say you have not seen changes in your body - 9 kg is a heck of an amount, especially considering you began at 93 kg - that's 10% of your body, unless I am missing something.
Secondly, I suspect that you are just training too hard. The only reason why you would not be adapting to the training despite doing it so long is that you are actually overdoing it in the session. You have to slow yourself down. You must finish 20 minutes feeling comfortable. The issue of why you get faster and faster as you get tired is interesting - how do you measure this? Is it your perception or does the machine actually tell you that you are going faster, or burning more energy. In my experience, when one is tired, it certainly feels much faster and harder, but it actually isn't. Is that possible in your case?
So I think that what you need to do is just control yourself when you train - you don't have to go all out, if you go slower, then you will be able to finish 20 minutes and that is what you need to aim for. Also, consider other forms of exercise. This type of exercise is quite restrictive, it almost forces an intensity upon you, so try to walk, or jog, or swim, if you can and see how that goes. I'm pretty sure that you are fitter, but I feel that you probably not regulating your training well enough to pick that up - in otherwords, is there any guarantee that you are going at the same speed now compared to 2 months ago? I suspect you are probably going much faster and that's why you feel just as tired. Try to back off, slow down and see how it goes.
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