The ornamental design for an exercisedevice, as shown and described.
FIG. 1 is a front and top perspective view of an exercise device, showing my new design;
FIG. 2 is a rear and bottom perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 9 is an enlarged view of a portion indicated with numeric 9 in FIG. 1;
FIG. 10 is an enlarged view of a portion indicated with numeric 10 in FIG. 1; and,
FIG. 11 is an enlarged view of a portion indicated with numeric 11 in FIG. 1.
The broken lines depict portions of the exercise device form no part of the claimed design. The dash dot dash lines in FIGS. 1, 9, 10 and 11 are for the purpose of depicting the boundary lines of the enlarged views and form no part of the claimed design.