Just satisfactory product ordered and delivered quickly, I rode as fast as I could to see if he would miss parts like IKEA and company or still missing something ... Well, after mounting it turns out that this solid design, supports weight up (100 kg max) ... After a few moments of effort, I found it very effective on the particularity of the year that are not found in gyms with their very sophisticated machines, but not enough thoughts .... Almost all the travails muscles and this is all the more interesting that it does not hurt back, or lumbago, or crushed discs. In short, no pain fear back, bravo to the inventor. It is recommended even for athletes to beginners.