hi! my body feels like a roller coaster in weight: up and down..for years. I have lost weight around 25+ lbs. but i am still heavy for my size. i cut my food and i have been busy so no time to sit and watch tv and veg. as much. but all it takes is a couple months on the couch im back to the same weight. does anyone recommend a certain type of elliptical machine or treadmill? thanks