If you're just learning double-unders (2 rotations per jump) then the Ultra Jump Rope is a great choice. It's actually slower than our Revolution Jump Rope which is nice while you're working on your timing. If you're experienced with double-unders, the Revolution Jump Rope is a great step up. It's extremely fast and revolves at blistering speeds. If you're looking to get an even faster rope, then we recommend the Revolution Jump Rope with Extended Handles.