Flex KitFlex is a foot and ankle strengthening device that eliminates the need for dancers to manually manipulate TheraBand's with their hands to strengthen and stretch their feet. With flex, resistance is created and stems from the hips and legs. Now, you are free to multitask! With an adjustable waistband and adjustable leg straps, you can set the exact level of resistance you want depending on your desired exercises, leg length, and flexibility. Flex