3 Yoga Fitness Resistance Exercise BeltProduct Description Get maximum results from your cardio workouts with the chest expander belt. It's made of soft, pliable rubber, so you can easily fold it up and take it anywhere. You can use it to stretch the chest and help exercise the muscles of the chest, abdomen, and arms to give you a tight figure. When you're working out, the chest expander belt helps you push your limits and build strength.