elliptical training or jogging?

There is a reason why jogging makes you tired faster than the elliptical. The elliptical is easier. Period. Your heart rate doesn't nearly rise and stay high as long as jogging does (in my opinion). My workout almost always consists of jogging unless my legs are sore. The elliptical are for people who cannot afford the joint problems of jogging, like 50 year olds. Even then I see 50 year olds jog regularly. Just don't jog on concrete or marble or something crazy. The point of cardio is making your heart healthier and stronger. And on top of that, it really helps making your body look better. With the elliptical you either have to use it for an hour to get the same impact as jogging for half and hour or work on it as hard as you would jogging - but good luck with that. Save time - jog.

If you want to jog, a treadmill is already cushioned with impact devices. And even then I recommend a treadmill more than the elliptical. Jogging requires a lot more equilibrium and doesn't concentrate on one area of the body like most cardio machines do when used regularly. If you're in your twenties, jog. You'll only get better.

Jam it back in, in the dark.

I find it hard to believe that, especially with my experience with cardio machines. I use the elliptical for a half hour and it won't burn nearly as many calories as the treadmill can (according to the respective calorie counts). In fact, if I convert it, it would be equivalent to walking perhaps 3-3.5 mph for that half hour, which is wasted effort. You would be better off setting an incline on the treadmill and walking the same speed. I would propose, if you're an elliptical user, high resistance and usage of the arms, which is something the treadmill cannot give you.

But alas, this is all my two cents; if the elliptical makes you get off your lazy ass then use it!

There's nowhere I can't reach.