The lower body most benefits in strength gain from stairstepping. The Stepmill has adjustable speed and resistance. Using it requires simple balance, but significant strength. Calves, hamstrings, quadriceps and gluteal muscles are trained by lots of repetitions, which is known for building lean muscle and burning fat. Additionally, increasing the resistance of each stepping motion adds challenge. Core muscles are engaged by keeping your balance, which is more challenging on the Stepmill than other similar equipment. The Stepmill is great for cardiovascular exercise due to its ability to raise your heart rate almost immediately. The level you set dictates workout intensity, but even at the lowest levels the heart is definitely getting a workout. The Stepmill makes the user work hard without being hard on the user. The stepping motion incurs less impact than a treadmill, but with higher cardiovascular results. The thoughtfully designed handrails provide a safe grip should a misstep occur, but don't allow you to cheat by leaning on them. The actual stepping motion forces the foot to remain mostly flat while climbing, versus the pedal format, which does not require the foot to leave the pedal. The stepping motion uses nearly every leg muscle. The product works, the activity works and it motivates my clients to work! Beyond the incredible new design of the Stairmaster products, Stairclimbing has a number of important benefits: Less Stress, More Efficient, Highly Functional