They say it works most of your body!

I have used it for max of an hour before and wondering if to bring myself back up to that stage or spend my time more on other cardio. I mostly use:
Treadmill
Exercise bike
Rower

How long do you use the treadmill for and how effective do you think it is?

When I get on the treadmill I can never decide it I should do it for a specific time, distance, or speed. I guess it's all about how I feel that day and I mix it up so I don't get bored. One time I will say that I am going to walk 5 miles and then the next time I will set a goal to walk for 45 minutes.

I think the treadmill is a very effective workout when you can maintain your pace. Walking is supposed to be the best thing for us.

I have never tried the rowing machine and I hate the climbers/stair steppers since they kill my knees.

I thought cross trainers were meant to be the best cos it limits the pressure on your joints and you use your arms too so get a more rounded workout?