A climbing apparatus comprises a plurality of steps secured between parallel side walls. Steps ascend from a lower position to a higher position at which they are secured to an end wall. End wall is perpendicular to the side walls and secured to the side walls with corner members. Corner members are at least partially hollow to accommodate vertically reciprocating adjustable handles. Adjustable handles preferably have a curved end to secure to and accommodate the sides of a shopping cart and can be locked at one or more vertical positions. End wall, corner members, side walls, and steps can be separate components fixedly attached with adhesive or fasteners or they can be integral with one another. Steps can include slip-resistant features, one or more non-slip feet can be placed on the underside of the climbing apparatus, and a safety gate can be included as well.