best type of cardio?
 

what type of cardio is most effective?
are certain machines better ect ??

I am doing cardio after my training session, 20-30 minutes and it works great, my abs can be seen.
However another idea is to do cardio in the morning on empty stomach. I tried this technique for 2 months and I was very happy with results however there were some days when I was very exhausted coz of these cardio sessions.

What is your target?

it obviously depends on what you want to achieve, if you want to get ripped then you need to drop your BF so eat less cals and train in the morning , if you just want to do cardio to keep fit , then just fit it in when you can 2 - 3x a week

Robbie fully covered the subject :)

I am doing different types of cardio and I am combining them in different days. However during winter I do not practice cardio.

I prefer 2 times per week on mornings on empty stomach.

cardio
 

Swimming is the best type of cardio by far.

It gets your heart rate up and works all of the muscles simultaniously.

All cardio is effective if you put the effort in mate.
Treadmill and X-trainer are good but its really what you put into your cardio that will make you lose bodyfat.

walking the dog twice a day!

I find x-trainer is awsome, the amount of calories I burn an hour would be 800. This is alot compared to the rower/bike but I can't say about treadmill as I do not use this.