Peace, mercy, and blessings of God be upon you, For sale: Original exercise machine (Air Walker). The machine is self-explanatory for toning the whole body, sculpting the waist, and home cardio. Machine features: Very clean: Lightly used, and the pictures show the condition. Easy to store: The machine's feature is that it folds (collapsible), meaning it doesn't take up any space. You can put it behind the door or under the bed after exercising. It is also better than a treadmill for those who suffer from knee pain because it does not put pressure on the joints.