I like treadmills and the way they do not add extra bulk to my frame. I am considering the purchase of an elliptical. Low end popular Schwinn model [sturdy]. My concern? I exercise a lot and do not want bulk added to my hips and thighs due to muscle conditioning. For those of you who use your ellipticals an hour a more a day-- for at least 3 continuous months, have you noticed more on your behinds/hips because of elliptical use? Q...