The ZoN Extension Kit enables you to choose and use the resistance training tube that’s right for you. Train selectively or use all three and train progressively. The ZoN Extension Kit provides three different resistance tube configurations for any exercise and fitness goal. The kit includes 1 oval Aerobic Band, 1 Figure 8 Aerobic Band and 1 Resistance Tube with handles. Stretchable tubes offer an ideal way to add the right amount of resistance to your workout without the use of bulky weights. All three items in the ZoN Extension Kit allow smooth, controlled movement and provide resistance throughout the entire range of motion. A safe, proven, do-anywhere routine to build strength and improve tone.