Cardio sucks so make it fun..
This is the time in the Gym when you can let your mind wander to get if off that burning feeling in your legs.
I use this time to people watch.
Mostly at the beautiful women but also at the funny, less fortunate dinkasoids...
Before you know it, your 45 or 60 min.'s are done and you can fall off the machine and crawl into the showers.