The ornamental design for: foot stool device for humans to reduce straining during expulsion of fecal matter, as shown and described.
FIG. 1 is a three quarter top-front-left side perspective view of a foot stool device for humans to reduce straining during expulsion of fecal matter showing my new design.
FIG. 2 is a three quarter bottom-rear right side perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right side view thereof; and,
FIG. 8 is a rear view thereof.
It is understood that the broken-away portions shown in the drawings represent indeterminate length/width/height.