The ornamental design for a horseridingmachine, as shown and described.
FIG. 1 is a perspective view of a horse riding machine showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof,
FIG. 4 is a left side elevational view thereof,
FIG. 5 is a right side elevational view thereof,
FIG. 6 is a top plan view thereof; and
FIG. 7 is a bottom plan view thereof; and
FIG. 8 is a perspective view of embodiment 1; and,
FIG. 9 is a perspective view of a second embodiment of the horse riding machine.
The broken line showing of the horse riding machine is included for the purpose of illustrating portions of the horse riding machine and forms no part of the claimed design.