If you have recently lost weight and are having an issue with the loose skin left behind, spiral machines are the way to go. To start off, these are just great all-around machines. They feature two totally different motions--Triplanar (up-down/front-back) and Pivotal (see-saw) that can be used independently or together. When used together, these two motors make a figure 8 motion. This is an extremely gentle motion on the gel areas of the spine and joints, with many benefits such as lymphatic drainage, improved circulation, improved bone density, pain reduction, detoxification and muscle building on the higher hertz ranges. These machines will increase circulation and provide massage benefits, both of which aid in the tightening of skin.