Xiser Commercial Mini Stairmaster, Black Cast Aircraft Alloy Ergonomically Optimum Design Light Weight 14 lbs.(Portable), NO ASSEMBLY REQUIRED 100% Made in USA Parts and Labor since 1977 The first stepping machine and only step sprint trainer on the market The only stepper that can be used for sprint training HIT and Aerobic protocols The lightest stepping machine on the market (13.5 lbs.) Easily adjustable resistance Assembles and disassembles for storage or travel in minutes Supports 400 lb (181.5 kg) more than any other stepper on the market Dimensions: L 21&#034; W 14&#034; H 4&#034; (Folded) 100% Made in the USA Designed by PhD&#039;s, not a marketing company Biomechanically correct ergonomics Perfect for the stand up desk Less than a gym membership saves time convenient safe portable sturdy virtually maintenance free Stand on the assembled machine both pedals even. Begin with the whole foot placed on the pedal. Eventually progress to only having the balls of the feet on the pedals (this requires more balance). Adopt a squat position (the ski position). <span class="a-text-bold">Your back should be completely</span> <span class="a-text-bold">straight,</span> weight focused straight down on the pedals. As you step, <span class="a-text-bold">Maintain a squat position, </span>stomach and gluteus should be tight at all times, <span class="a-text-bold">keep your torso and head completely motionless. NO BOBING!</span>  This will increase the intensity and strengthen the stabilizer muscles, improving balance and agility. Imagine you are balancing a glass of water on your head *both feet should remain in contact with the pedals at all times; drive with one leg resist with the other (always push down and never lift up) After a one-minute bout, you should be out of breath and experiencing the &#034;burn&#034; look younger muscle mass increase increased bone density healthier looking nails and hair all internal organs receive a boost eyes get brighter for aging persons, human growth hormone is like magic