The ornamental design for a multifunctionexercise apparatus, as shown and described.
FIG. 1 is a front-top-left perspective view of a multifunction exercise apparatus showing my new design;
FIG. 2 is a front-top-right perspective view thereof;
FIG. 3 is a front-bottom-left perspective view thereof;
FIG. 4 is a front elevational view thereof, the rear elevational view being a mirror image thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a right elevational view thereof, the left elevational view being a mirror image thereof.
The broken lines showing of anti-slippery ridges in FIGS. 1-7 are included for the purpose of showing environmental structure and form no part of the claimed design.