The ornamental design for a breathing apparatus for assistingbreathing and training techniques, as shown and described.
FIG. 1 is a rear view of a breathing apparatus for assisting breathing and training techniques according to the present invention;
FIG. 2 is a rear perspective view;
FIG. 3 is a bottom plan view;
FIG. 4 is a front elevation view;
FIG. 5 is a front perspective view;
FIG. 6 is a top plan view; and,
FIG. 7 is a side elevation view, the opposite side elevation view being a mirror image thereof.
The broken line showing is included for the purpose of illustrating a boundary with the line itself and the area within forming no part of the claimed design.