The presently disclosed subject matter is directed to a device that can be used to exercise and/or strengthen the muscles of the foot, ankle, and/or leg of a user. The device includes foot-receiving pedal that is sized and shaped to provide support for a user's foot or shoe. The pedal includes a first pair of brackets positioned at the rear of the pedal that allow connection to the support at a joint. The support can include a band that rests against the user's leg to provide comfort during use. The joint allows the pedal to move relative to the support. One or more resistive elements (e.g., springs) attach the support to a second pair of brackets positioned at the front portion of the pedal to provide resistance to the movement of the joint. The support includes an adapter that allows the attachment of the springs to be modified to vary resistance and/or be customized to a user's particular leg shape or length.