Sunny Health & Fitness Smart Foldable Stair Climber with Balance-Assist Cords – SF-S025005 delivers a full-body, low-impact climb that mimics natural vertical movement for cardio and strength. Supportive balance-assist cords make starts feel easier—great for beginners—while smoothing cadence and adding light upper-body engagement. An extended step range supports 8.9–21.5" step length so you can go long for max activation or short for joint-friendly endurance. Connect to the free SunnyFit App for guided stair programs, real-time metrics, scenic routes, and AI-personalized plans. A stable triangular frame supports 330 lbs, folds flat for easy storage, and features 4-level handlebars, an LCD (time, calories, steps, SPM, total count), and a secure device holder. Est. in sunny California since 2002, our U.S.-based team supports your “Fit for Everyone” journey.