Can anyone tell me more about?

High intensity interval training? Like on the treadmill and cross trainer?
How exactly to do it, etc?

I'm 22, weigh 110kg and have asthma.

Thanks

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Answer:
Also known as Anaerobic exercise. You should start with a warm up of around 5 minutes walking on a level 2 gradient to start as you have asthma and its probably wise to ease into it.
Anaerobic is where you keep you heart rate up, so even when you rest you dont let your heart slow down much before you begin to raise it again.
What you need to do is do short intensive bursts of exercise and then short rest periods. So for instance 2 minutes running/jogging whatever you can manage, then 2 minutes walking (by relaxing I mean slowing down but never stop moving), followed by 2 minutes running/jogging and then 2 minutes walking and so on. As you get fitter you can up the work out to 3 minutes and 2 minutes walking and so on. Keeping the walking at 2 minutes and increasing the running as you get fitter.
Its ideal to do this on a incline gradient of 3 but start on 2 depending on how you feel.
Same concept would apply to the cross trainer but you need to have a resistance to go against otherwise you wont get the same effect. Dont just jump on not set some sort or resistance.
Also one thing I learnt is dont work out with friends. If you can chat whillst exercising your not working hard enough.
Good luck

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Answer:
it involves going slow for state a min and then going flat out for a min slow fast slow fast to put it simply