FIG. 1 is a top, front and left perspective view of a treadmill showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is an enlarged partial view of FIG. 1;
FIG. 9 is an enlarged partial view of FIG. 2; and,
FIG. 10 is an enlarged partial view of FIG. 4.
The broken lines in the figures illustrate portions the treadmill that form no part of the claimed design.