Lifespan Fitness ST-15 Vertex 4 Level Commercial Stair ClimberFor a complete cardio and strength training machine, the ST 15 Vertex 4 Level Commercial Stair Climber Stepmill delivers a next level workout, helping you to achieve and smash your fitness goals. Stair climbing exercises engage the full body, developing functional strength, building muscle and increasing endurance all in one workout. GENERAL Speed: 22 Steps Per Minute ~ 124 Steps Per Minute Step Area: Revolving staircase with eight steps, 18 cm high,