Independent Quality-Assurance Tested to Highest Safety Standard: Voluntary compliance to ULs inversion table safety standard makes Teeter Hang Ups the only inversion brand with certified quality. EZ-Reach Ankle System: The extended handle for the ankle lock system provides an easy-to-reach solution in addition to its triple lock security feature. Stretch Max Handles: Robust handles with angle guide offer greater user assistance while becoming familiar with inversion and enhanced stretching options for experienced inverters.