A while back, I learned from my trainer that if you do Elliptical pedalling backwards, you can work different muscles, especially your back thighs/butt. And then I also read that interval training gives you more for your time, so this is what I usually end up doing on the Elliptical.
<Pedalling backwards>
Duration: 20~25 minutes (including warmup and cool down)
Pace: Intervals -
FULL speed for 15 seconds at every minute 1:00, 2:00, 3:00, and so forth, then go 45 seconds for moderate speed, and then back up to full speed again at the next full minute, and REPEAT.
Interval training really gets your heart pumping, and I break into a sweat much faster than I would going at moderate speed. You can consider trying this out, or if you have one of those preprogrammed "interval" programs