Portable Training Device

FIG. 1 is a front upper isometric view of the ornamental design for a portable training device;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a front upper isometric view thereof of the portable training device in its environmental setting.

The broken lines are included for the purpose of illustration portions of the portable training device and environmental structure that form no part of the claimed design.