Sports swing training devices, namely, tennis swing training devices having an elongated flexible component, a handle at a first end of the flexible component, and an anchoring component at a second end of the flexible component for fastening to a door or fixed point; fitness devices for replicating a swing motion and mechanics having an elongated flexible component, a handle at a first end of the flexible component, and an anchoring component at a second end of the flexible component for fastening to a door or fixed point