So after all that, what one reads here, I had my doubts after the intensity of the devices.
I am mid-twenties and computer scientist, am not Krafpaket but also no "half-pint" and find the right coach.
Sure, the first 15 - 20 x can completely compress the coach without any problem, but eventually it will stop also difficult;).
I have been training for a week from time to time, when I have just nothing to do, and realize some progress. - For this price you can not go wrong.
