The ornamental design for an exercising apparatus, as shown and described.
1 . Exercising apparatus
1.1 is a front view.
1.2 is a front perspective view.
1.3 is a left side view.
1.4 is a right perspective view.
1.5 is a rear view.
1.6 is a rear perspective view.
1.7 is a right side view.
Anatomical supporting element, particularly adapted to be used as a sitting support for physical and/or relaxation activities, such as, yoga, pilates and meditations of various types.