hey people... this may sound a little weird. i do intense cardio everyday burning up to 2000 cals but i have one problem... about 30minutes into cardio (on the elliptical) my toes and then both feet become completely numb. its a real pain in the ass. Anybody with any ideas of ways to stop this from happening. Perhaps its the shoes im wearing? perhaps i have poor oxygen circulation? ----all suggestions welcome please.