Chinese manufacturer that has built non-motorized curved treadmills for about ten years, selling direct at ronglefitness.com and through Amazon, Walmart, and eBay. It runs its own factory and handles its own after-sales.
A curved, non-motorized treadmill with a rubberized track - the rubber-track revision of RongLe's QZD-103, which swaps the original bare-steel slats for rubber. Retailers list it simply as the QZD-103 with an "upgraded rubber running track"; "-XJ" is shorthand for the rubber revision, not a SKU printed on any listing. At around $700 on Amazon it's the lowest-priced manual on the market, undercutting ERGOLIFE (~$900) and well below Office Walker (~$1,200) or Walkolution. The earlier bare-steel version drew poor reviews (2.3 stars across 22 Amazon ratings); the rubber-track revision was new and largely unreviewed as of early 2026 (around 3 ratings), so independent data is thin. One owner on Reddit reports walking 25,000-35,000 steps a day on it while working, with no problems several months in.