Using a reverse motion is no more effective than the normal style of using an elliptical. Any exercise that takes you from a bent hip position to a straight leg/hip position will work the butt. The butt, or glutes, perform hip extension, which is what happens at the hip when you go from sitting to standing. The resistance level on cardio is most likely not enough to significantly impact butt muscle size, so a slight variation in performance will most likely have little impact. It can however, break the monotony and be fun, so if you are doing it for those reasons, then by all means, continue and enjoy it.
Using a reverse motion is no more effective than the normal style
of using an elliptical. Any exercise that takes you from a bent hip
position to a straight leg/hip position will work the butt. The
butt, or glutes, perform hip extension,...
More