I claim, the ornamental design for an exercise assisting apparatus, as shown and described.
FIG. 1 is a perspective view of an exercise assisting apparatus, 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; and,
FIG. 8 is a perspective view thereof used by the user. The broken lines showing the user are included for the purpose of illustrating the invention in use and form no part of the claimed invention.