i am at the end of my 3rd week with sus. and i am seeing great gains already gained 13 pounds but should i be doing cardio? i have been just hitting the weights 2 days on and 1 day off. ive never really worked out so can any1 give me some sugg.?? also i have been waking up in the middle of the night with my arms going numb. is this common for some1 that is working out hard or gaining weight quickly?