The ornamental design for an inflatabletrainingdevice, as shown and described.
FIG. 1 is a perspective view of an inflatable training device showing my new design;
FIG. 2 is a top view the inflatable training device of FIG. 1;
FIG. 3 is a bottom view the inflatable training device of FIG. 1;
FIG. 4 is a left side view of the inflatable training device of FIG. 1;
FIG. 5 is a right side view of the inflatable training device of FIG. 1;
FIG. 6 is a front view of the inflatable training device of FIG. 1; and,
FIG. 7 is a rear view of the inflatable training device of FIG. 1.
The broken lines shown in the figures are for the purpose of illustrating portions of the inflatable training device, which form no part of the claimed design.