Back support

The design consists of the features of shape, ornament, pattern and configuration of the portions of the BACK SUPPORT shown by solid lines in the drawings. The portions of the design shown in dotted/stippled lines form no part of the design. The bold wavy lines is not a feature of the design, but rather outlines an area of the article that does not embody any feature of the subject design.Drawings of the design are enclosed in which:FIGURE 1 is a front isometric view of the BACK SUPPORT embodying the subject design;FIGURE 2 is a front side elevation view of the design of FIG. 1;FIGURE 3 is a back side elevation view of the design of FIG. 1;FIGURE 4 is a top plan view of the design of FIG. 1;FIGURE 5 is a bottom plan view of the design of FIG. 1;FIGURE 6 is a left side elevation view of the design of FIG. 1; andFIGURE 7 is a right side elevation view of the design of FIG. 1.