Get effective strength training at home with the GoFit Rubber Resistance Training System. The GoFit Ankle Strap is a key element of this portable weight-resistance system. Note: A GoFit Door Anchor MUST be used with the GoFit Ankle Strap for your lower body workout. For proper product installation and usage, follow the detailed instructions included with each product. For safe use, the GoFit Power Tube must be attached to a GoFit Door Anchor. Place the GoFit Ankle Strap around your ankle, and then attach the free end of the GoFit Power Tube or Super Band to the Ankle Strap carabiner. Now a variety of lower body exercises, pulling – or pushing – away from the Door Anchor may be safely executed. The GoFit Rubber Resistance Training System lets you purchase each item separately to create your own ultra-effective workout. As your training progresses, simply expand your system with more resistance options. For example, use one Ankle Strap and Door Anchor with a variety of Tubes or Bands depending on your particular workout regimen.