My brother who challenged me to this in the first place, told me to slow down. So what I'm going to do is do level 14 for 2 weeks straight, which right now on my second week with. Then I will do level 15 for 2weeks. Then I will jump to 16 for 1week, and work my way up from there. My ultimate goal is level 17, the same resistance level I was at when I was skinny.
It's mind over matter. Whenever something tells me you can't do this, while I 'm already working out on the Elliptical. I say my head to this imaginary enemy, "oh really, I'm doing this level and still going strong." After that, the imaginary enemy silences, and I keep exercising. Small victories for me. Woo hoo!