The ornamental design for a spinalsupport, as shown and described.
FIG. 1 is a front view of the spinal support;
FIG. 2 is a rear view of the spinal support of FIG. 1;
FIG. 3 is a left side view of the spinal support of FIG. 1;
FIG. 4 is a right side view of the spinal support of FIG. 1; and,
FIG. 5 is a top view of the spinal support of FIG. 1.
The broken lines in the drawings indicate environment/structure and form no part of the design to be patented. A bottom view of the spinal support has been omitted as it is duplicate of the top view as the bottom view is a mirror image of the top view.