The ornamental design for a portable battingstance and swing training aid, as shown and described.
FIG. 1 is a perspective view of a portable batting stance and swing training aid showing our new design in use, and with the two base components in an extended and separated state;
FIG. 2 is another perspective view showing the design with its parts in an exploded state;
FIG. 3 is a top plan view of the assembled design wherein the foot support elements are in an alternate expanded spacing;
FIG. 4 is a side elevational view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is an end elevational view thereof;
FIG. 7 is an enlarged scale perspective view of one of the upper exploded components shown in FIG. 2; and,
FIG. 8 is a perspective view showing the base portion of the design in an alternate partially folded position.
The broken lines shown in the drawings depict environment and portions of the portable batting stance and swing training aid that form no part of the claimed design.