The ornamental design for a therapeuticsupport, as shown and described.
FIG. 1 is a perspective view of the therapeutic support showing my new design.
FIG. 2 is a right side elevational view, the left side being a mirror image thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken line showing of a foot in FIG. 1 is included for the purpose of illustrating environmental structure and forms no part of the claimed design.