The PowerArc Resistance Cable system features a patented free motion cable slide design that allows the cables to rotate around the handle. This provides more exercise options than traditional resistance tubes and allows you to get the most out of your workout by engaging more muscle groups. The PowerArc system can be used for small, micro-movement exercises as well as big, multi-plane power moves. Great for use at home, the gym, or travel. USE ONLY WITH LIFELINE POWERARC RESISTANCE CABLES (SOLD SEPARATELY).