A portable exercise apparatus configured to attach to a vertical structure. The apparatus includes a top strap attached to a hook and a bottom strap attached to a second hook, the top strap and bottom strap can be wrapped around the vertical structure and secured at the apparatus. The apparatus can be secured tightly against the vertical structure so it will not slip downward. A bar which can be perpendicular to a length of a body of the apparatus can be used for performing exercises such as pull-ups and/or chin-ups.