The expected lifespan of a new treadmill varies depending on multiple factors such as quality, usage, maintenance, and initial condition. However, on average, a treadmill can retain its peak performance for about five years, and with proper care and maintenance, it can last for a decade or more. It's important to note that continuous use, which means using the treadmill almost every day, can shorten its lifespan. signs that a treadmill may need replacement include a slow speed due to motor or belt issues, a slipping belt, a broken deck, or excessive wear and tear that can lead to safety hazards. Regular maintenance, such as checking belts, cleaning decks, and lubricating moving parts, can help extend the treadmill's life. Ultimately, if the treadmill is still under warranty, any damage should help guide you towards determining the need for a replacement. If the treadmill is showing signs of significant wear beyond its expected lifespan, it may be time to invest in a new one.