The ornamental design for a golftrainingwheel, as shown and described.
FIG. 1 is a perspective view of the golf training wheel, the broken line showing is for illustrative purposes only and forms no part of the claimed design;
FIG. 2 is a perspective view of the golf training wheel;
FIG. 3 is a bottom plan view of the golf training wheel;
FIG. 4 is a top plan view of the golf training wheel; and,
FIG. 5 is a side elevational view of the golf training wheel.