When you are working out, instead of keeping your feet glued to the pedals, lift them up as in running. In fact, I like to consider the elliptical workout a type of running (like running in mud) and do it as if I am running. Then you won't have any numbness in your feet. The numbness results from applying pressure over a small area all the time for too long. If you lift your feet periodically, it won't happen.