So any suggestions on legit products out there similar to the NOX, etc., that don't cost an arm and a leg? I see so many when I go to GNC, but I don't really know what's useful and what's not. I'm just looking for something that is going to help me with increasing my stamina during cardio, along with help with my muscle strength in weight training. As it is I am extremely weak because I've been out of the gym so long, but once I get back into my routine and all, I'd like to get something that will help me out, if there are any products that do this (Ie: creatine, but I've heard it's not as useful as all the hype)