The ornamental design for a pull-up bar, as shown and described.
FIG. 1 is a front and top perspective view of a pull-up bar, showing my new design;
FIG. 2 is a rear and bottom perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a left side elevation view thereof;
FIG. 8 is a right side elevation view thereof; and,
FIG. 9 is an enlarged view of a portion labeled, ‘FIG. 9’ in FIG. 1.
The broken lines in the figures illustrate portions of the pull-up bar that form no part of the claimed design. The dash dot dash lines in FIGS. 1 and 9 are for the purpose of depicting the boundary lines of the enlarged view and form no part of the claimed design.