This is one incredible and fantastic piece of exercise equipment! For the price, it is a super buy! It provides a rocking motion, which may seem simple at first, however, after just a few minutes standing on that machine, or sitting on the platform, you will discover it is much more than simple. The rocking motion improves balance, coordination, movement of various body motions. As you stand on the platform, you can rotate and bend your knees, and create "dance" motions which further enhance toning of the muscles. You can also hold and lift hand-weights, and the added rocking motion greatly increases the strengthening of muscles, which you will sense in your calves, your thighs, and buttocks. And this is all on LOW settings, too! I would not recommend setting higher than about 3 or 4 level, not until you become much more adept at using the machine. I would AVOID using higher setting over 5 or 6, at least initially, and not even use the higher settings. There is virtually NO NOISE, and the machine I purchased is very sturdy, very quiet, and feels like a high-quality machine. I have it sitting outside on my covered patio, however, the machine is probably best suited in-doors, as it is a quality piece of equipment. It is quite heavy, and does not "move about", and is very stable. I read that this machine was originally developed by Russians. It is NOT a toy, though you will experience a lot of enjoyment using it, and if you run two cycles, with ea cycle at ten minutes, you will likely be sweating profusely even at low settings of only 4 or 5! The "simple" rocking motion creates FAST TONING of muscles. My machine has level up to 20, far too powerful for me to endure at this time. Most people should start at level one only, and work-up to level two and so forth. You will feel the 'burn', a good sensation that your muscles have had a good work out. If you hold and lift hand-weights of 5#'s each, biceps and triceps as well as calves and thighs will have an incredible work-out! Your muscles will quickly become very toned. I use 15# hand-held weights, and simply lifting those weights above the head is a strongly felt motion/exercise. You can also sit on the platform, though I would recommend using a small pillow. Also, probably best to wear sturdy tennis shoes etc while standing on the platform -- you will notice your feet also get a work-out. As you become more accustomed to the rocking motion, you will quickly advance to being able to move about without holding onto the bars, and will notice greatly improved strength and balance and sense of increased co-ordination -- this is hard to describe. It's a very well-built machine. I plan to use mine 'forever'. Mine was manufactured in Korea .....the quality is superb. Do NOT let children attempt to play on it, it probably requires supervision. For some people: May wish to wear knee 'stabilizers' initially, unless using only at lowest settings. There is no doubt, after using the machine, there is increased oxygenation of blood, and organs; and likely increases the flushing of the 630+ lymph glands throughout the body, too, which improves the entire immune system. You will feel the work-out effects very quickly, and profoundly. And it is so "SIMPLE" and easy to use. :) It's FUN, too!