The Core Trainer builds muscle and increases core muscular endurance
It improves your strength for superior performance
It improves flexibility and aids the loss of body fat
The Core Trainer's effectiveness comes from using your own body weight to work against gravity, allowing you to perform a hundred different exercises
Best of all, it is inexpensive, light (less than 1kg), highly efficient and versatile. It can be used at home, at the gym, indoors and outdoors.
The Core Trainer also comes with the door anchor.