Our expert says:
11% is not bad at all, I'm not sure whether that was the source of the problem. Even the fact that it climbed to 13% - that's more a function of a mistake in measurement than any real change.
It's important to understand that measuring body fat is not an exact science, and there is an error, or about 2% (or higher) and so you can't overinterpret the value too much. SO certainly, I would not worry about that part of it.
To answer the second part of the question, I think you need to look at diet here, before exercise. Fact is, you're not overweight, and that means that losing weight is not as easy as it is for someone who weighs say 100 kg and wants to knock off 10kg.
So it's important to assess your diet, because once you start getting down to the 'limit', then diet becomes much more important than training.
Training is still vital, of course, and I do suggest you do it. My assessment of your current training is limited, I admit, but I do think you need more constant intensity training. Skipping and start jumps and other high intensity training is tough to do for a long time, and you need to be aiming for 45 minutes or so per day, not only 20. So that's the one change, allied to a change in diet.
Finally, with reagards to the measurement of body fat, don't bother. Seriously, the error is too large - any calculation is going to be inaccurate, so unless you can do it properly, using the state of the art method, you are better off not doing it at all. Rather focus on your fitness, and let the rest take care of itself.
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